[Q] SM-G900f won`t boot into recovery or download mode - Galaxy S 5 Q&A, Help & Troubleshooting

Hi Guys.My G900F is about 2 months old.I was running CM 12 when I developed a problem with the volume button sticking which meant it kept turning the sounds down and if I turned it up,it kept turning down.I contacted O2 about a repair and they said fine,send it in so I tried to put a stock rom back on ,so no to void the warranty.
Once I did this,the phone kept going into safe mode but other apps were still installed like TWRP,SuperSu etc so I tried to remove them as well but here`s where the problems got worse.
Now when I try to boot into recovery,I just get the Samsung splash screen with a blue light.
If I try to boot into download mode,I get the download mode screen but when I press volume up,to proceed to download mode,nothing happens.
Have I bricked it completely,or can it be saved?
I really have tried everything but that`s the only 2 screens I get-Samsung splash when trying recovery and 1st download mode screen .
I`ll happily send it off for repair if needs be,so a good repairer recommendation ,in Northern Ireland,or UK would be appreciated.
Cheers.
PS.
When I connect the phone to my pc,the Samsung driver won`t install.

If the volume button is damaged, you need that to enter download mode fully
If still rooted, you could try this
https://play.google.com/store/apps/details?id=com.siriusapplications.quickboot&hl=en_GB
It might bypass the need to hit Vol Up when you enter download mode (Bootloader)

Thanks but I can`t boot the phone up to install any apps.

Send it off for repair then, KNOX tripped they'll likely refuse warranty anyway
Or open it yourself and see if you can sort the volume button out

Can you recommend someone that could do a full repair via post?

d4rren51 said:
Can you recommend someone that could do a full repair via post?
Click to expand...
Click to collapse
Samsung

Related

finally from Samsung How to Solve the Black screen (death screen )

after mailing SAMSUNG by Mr.Alzubair
from ce4arab website
about the Death screen
this is the answer :
-----
Dear Alzubair ,
Thank you for contacting Samsung Electronics.
Reference number:2104286715
Regarding your case, kindly note that the image you have displayed on
the screen of your phone, indicates that the device has entered the
Recovery Mode. The reason this happened, is because you have tried to
update the device’s Firmware, which isn’t actually released yet, and
that’s the reason why the Software crashed as well.
In order to get out of the Recovery Mode, please follow the steps below:
Recovery Process
1.Remove the battery and reinstall it. Power On your Phone
- Phone display “Connection picture for Phone to PC”
2. Recovery Mode in Kies
If upgrade failed in upgrade step, you can see next Pop-Up
- Select "Yes”
Firmware Upgrade program progress to recovery mode.
3. Select "Recovery" button.
4. Read the caution and check “all information has been verified”
- After this, it’s same with Firmware update Process
5. Click “Next”
- Firmwareversion display
- Firmware file is downloaded to PC
6. Firmware update
- After Firmware downloaded, Click “Next”
- Firmware update start
Caution
- Never disconnect or turn off the
device in thisstep
- If so, recover the phone refer to
recovery section
7.Complete
- After Firmware update complete, the device reboot
automatically
- Click “Next” Button
To do this manually instead of using Kies, please click on the Power
button, the Volume down button and the middle button all together all at
the same time. The phone would flash for 2 times, and on the 3rd time,
please remove your hands fromthe phone, and it should boot up normally.​
I hope this has been of some assistance to you. If you do have any
further queries, please do not hesitate to contact us quoting your 210-4286715
reference number.
Kind Regards,
Aya Smith
Samsung Electronics UK
Customer Communication Centre
Tel.: 0845 726 7864 (All calls charged at Local Rate)
Homepage: samsung.com
[Product] GT-I9000
The reason this happened, is because you have tried to
update the device’s Firmware, which isn’t actually released yet, and
that’s the reason why the Software crashed as well.
Click to expand...
Click to collapse
Bwahahahhaahahahahh!!
cheetah2k said:
Bwahahahhaahahahahh!!
Click to expand...
Click to collapse
LOL XD
at least they help me
I just tried it ( by the Manual way ) and it Works
so this works on the semi-bricked, no 3-button combo enabled phones ??
.. let's say, after a bad/failed bootloader flash ?
someone please confirm ?
later edit:
from what I understand after reading this, Kies can force any (Phone--!--PC) SGS into recovery and/or download mode?
if so, can we "extract" this feature and make it into a stand alone solution for half-bricked phones?
That's not a real black screen, I got one and my phone got the BSOD: No possibility to power on, no charging, nothing.
The "phone ! computer" is just a semi brick, get back to download mode and reflash with odin...
But thanks for the info indeed.
franklin01 said:
The "phone ! computer" is just a semi brick, get back to download mode and reflash with odin...
Click to expand...
Click to collapse
Some SGSs can't access download mode from that screen because of the proper bootloader that's missing. (3 button combo fix needed, not so safe)
wish samsung also adds a feature to kies that fixes the IMEI =D
franklin01 said:
That's not a real black screen, I got one and my phone got the BSOD: No possibility to power on, no charging, nothing.
The "phone ! computer" is just a semi brick, get back to download mode and reflash with odin...
But thanks for the info indeed.
Click to expand...
Click to collapse
2day i triad it two times and it works
but from what i understand same thing happened to me today ..
i did the 3 times flashing way :
BE SURE THAT YOU disconnect THE CABLE!!
To do this manually instead of using Kies, please click on the Power
button, the Volume down button and the middle button all together all at
the same time. The phone would flash for 2 times, and on the 3rd time,
please remove your hands fromthe phone, and it should boot up normally.
Then its work and downloading mode appear i installed an official Ver. by odin ( check on Re-Partition ) then it will work (work for me after the same thing that happened : No possibility to power on, no charging, nothing. )
Does this means that the phone has a secondary bootloader or what I dont get it, I already sent my phone to samsung so I cant try, I had my phone bricked stuck at a black screen after the S logo.
hang on... so it sounds like samsung is saying that phones that dont go into download mode straight away from vol-down, home and power need to keep holding the power button until the power cycles 2 times, then let go on the third?
i cant test it now because after i bricked my phone (black screen no power on or charge) i sent it back and i got a new motherboard with 3-button enabled... but this does make sense because when i had a 3-button disabled phone previously i did manage to get it into download mode from the phone-!-computer screen by trying different timings. it took a long time but eventually worked.
so it would seem if this is the case, that it is just a different boot loader and a different key combination to access download mode, but working nevertheless?
can someone test this?
Cant believe it, if the phone does has a secondary bootloader then it cannot be bricked forever.
Sent from my GT-I9000 using XDA App
stephengoo said:
Cant believe it, if the phone does has a secondary bootloader then it cannot be bricked forever.
Sent from my GT-I9000 using XDA App
Click to expand...
Click to collapse
We already knew it had a secondary boot-loader...
http://forum.xda-developers.com/wiki/index.php?title=Samsung_Galaxy_S_Series#Partitions
This is what is patched to hotfix the 3BR in disabled phones.
3 times flashing way wont work for me, and at Recovery in Kies i cant see my Device!
Absolutly no USB!!!!
Sorry Guys!
So this forced download mode can be possible...
This guy here tried hard to explain same thing:
http://forum.xda-developers.com/showthread.php?t=812933
do you think it will work with korean version galaxy s?
No-Exit said:
3. Select "Recovery" button.
4. Read the caution and check “all information has been verified”
- After this, it’s same with Firmware update Process
To do this manually instead of using Kies, please click on the Power
button, the Volume down button and the middle button all together all at
the same time. The phone would flash for 2 times, and on the 3rd time,
please remove your hands fromthe phone, and it should boot up normally.​
[Product] GT-I9000
Click to expand...
Click to collapse
"all information has bee verified" means put phone in download mode and connect it to PC (can't do it without working 3 buttons combo).
"manually instead of using Kies" = same thing, doesn't work without 3 buttons combo.
This doesn't works if you didn't have 3 buttons combo enabled. I used heat trick instead and then patch aires P-SBL.
I sent my phone back because of this black screen of death. I could get into Download mode, and the other (vol-up) mode too, but no upgrading or changing firmwares worked to fix it. And Kies didn't see it, though Odin eventually did.
Wondering now if the Black Screen of Death was fixable after all, but then would Kies have to recognize it first?
I have a phone ! pc bricked phone right in front of me, I've tried this and a million other combinations, nothing works. I'm not being super pessimistic or anything it really doesn't work. I've left it with a phone repair store overnight and they couldn't fix it either. Im going to visit samsung/optus tomorrow.
edit:
I also want to point out that that message contains some horrible english supposedly from samsung UK
d47:
I am exactly in your shoes. Even with the overnight leave at a GSM repair booth-thingy. Im also considering handing it back to the retailer, but havent tried the heating up trick yet... Maybe its worth a try ?

[Q] Jammed Volume Button

Hello,
My Samsung Galaxy S4 is still under warranty, and the volume down button seems to have jammed. This has resulted in my phone being constantly booted onto the screen where I can either download a custom OS or restart the phone. The problem is I cannot choose either of these options as the volume down key is stuck and I can't choose either. I then have to restart my phone and, surprise surprise im back on that screen. The only way around this is to hold the volume up key, which then takes me into safe mode. I have previously rooted this phone so I cannot take it in for warranty, but I was wondering if there was any way to either boot my phone into the normal mode or to remove the root so I can take it in under warranty.
Thanks for any help.
Use ADB to boot into download mode (search; tutorials/how to's easily found on here/Google), flash 3 part stock rom which will wipe it, send it in for warranty service. Sorted.
MistahBungle said:
Use ADB to boot into download mode (search; tutorials/how to's easily found on here/Google), flash 3 part stock rom which will wipe it, send it in for warranty service. Sorted.
Click to expand...
Click to collapse
Thank you so much for such an easy and quick response! I'll write back here when I'm done to let you know how it went. Thanks again!
MistahBungle said:
Use ADB to boot into download mode (search; tutorials/how to's easily found on here/Google), flash 3 part stock rom which will wipe it, send it in for warranty service. Sorted.
Click to expand...
Click to collapse
Tried this method, and fell at the first hurdle. Not sure if its because I'm in safe mode but couldn't get ADB to work. It wasn't installing the drivers and wasn't being recognised when I checked for ADB devices..

MY LG G2 for verizon is bricked HELLLPPPPP PLEASE

sorry to bother you all. i bricked my device and it's only a few hours old. I rooted it using the io root method. that was painless.
anyway, it didn't brick then. i got a notification from verizon for the 4.4.2 update so I clicked download update it never installed and that's when the bricking started. Anytime I connect it to the computer it opens up like 40 disks and it says cannot be used unless it's formatted so I have to spend a while canceling those out. when I restart the phone it says the lg logo then the screen goes black . im stuck. i've been trying for hours. if i get the phone back i won't root it or do anything. ill deal with the bloatware, whatever. i've tried a lot of different things but to no avail. any help is appreciated. thank you for your time...and wont go into download mode....help please anyone....
i have no recovery installed....every time i try to cut the phone off it vibrates screen goes off and on showing the lg logo very quickly then goes black but remains on until battery drains
Im in the same boat
xdavelope said:
sorry to bother you all. i bricked my device and it's only a few hours old. I rooted it using the io root method. that was painless.
anyway, it didn't brick then. i got a notification from verizon for the 4.4.2 update so I clicked download update it never installed and that's when the bricking started. Anytime I connect it to the computer it opens up like 40 disks and it says cannot be used unless it's formatted so I have to spend a while canceling those out. when I restart the phone it says the lg logo then the screen goes black . im stuck. i've been trying for hours. if i get the phone back i won't root it or do anything. ill deal with the bloatware, whatever. i've tried a lot of different things but to no avail. any help is appreciated. thank you for your time...and wont go into download mode....help please anyone....
i have no recovery installed....every time i try to cut the phone off it vibrates screen goes off and on showing the lg logo very quickly then goes black but remains on until battery drains
Click to expand...
Click to collapse
Did just like you with OTA today and now bricked. Guess I will have to call Verizon and see what they can do.
xdavelope said:
sorry to bother you all. i bricked my device and it's only a few hours old. I rooted it using the io root method. that was painless.
anyway, it didn't brick then. i got a notification from verizon for the 4.4.2 update so I clicked download update it never installed and that's when the bricking started. Anytime I connect it to the computer it opens up like 40 disks and it says cannot be used unless it's formatted so I have to spend a while canceling those out. when I restart the phone it says the lg logo then the screen goes black . im stuck. i've been trying for hours. if i get the phone back i won't root it or do anything. ill deal with the bloatware, whatever. i've tried a lot of different things but to no avail. any help is appreciated. thank you for your time...and wont go into download mode....help please anyone....
i have no recovery installed....every time i try to cut the phone off it vibrates screen goes off and on showing the lg logo very quickly then goes black but remains on until battery drains
Click to expand...
Click to collapse
BAYOUREBEL said:
Did just like you with OTA today and now bricked. Guess I will have to call Verizon and see what they can do.
Click to expand...
Click to collapse
DId you not try and go back to stock?...
http://forum.xda-developers.com/showthread.php?t=2432476
xdavelope said:
sorry to bother you all. i bricked my device and it's only a few hours old. I rooted it using the io root method. that was painless.
anyway, it didn't brick then. i got a notification from verizon for the 4.4.2 update so I clicked download update it never installed and that's when the bricking started. Anytime I connect it to the computer it opens up like 40 disks and it says cannot be used unless it's formatted so I have to spend a while canceling those out. when I restart the phone it says the lg logo then the screen goes black . im stuck. i've been trying for hours. if i get the phone back i won't root it or do anything. ill deal with the bloatware, whatever. i've tried a lot of different things but to no avail. any help is appreciated. thank you for your time...and wont go into download mode....help please anyone....
i have no recovery installed....every time i try to cut the phone off it vibrates screen goes off and on showing the lg logo very quickly then goes black but remains on until battery drains
Click to expand...
Click to collapse
If you can't boot into stock recovery (vol down + power key) and can't get into download mode (this is where they detect root once FW update shows up and the bottom left corner says Bootloader: ROOTED) then you can rest assure as long as you are under warranty, send it in to LG directly.
Do not send it to Verizon as you may incur charges for replacement. There's insurance from Verizon, but the real "replace with no charge" warranty is sending it to LG directly. Make an account on their website, register your G2, and make a Repair request by online chat or phone.
I just got my T-mobile G2 back after 2 weeks with the same issues and while it took a while to get repaired, I didn't pay a penny and it works without T-Mobile ever knowing its different hardware (all they replace is the flash memory that is corrupted in the phone).
Only downside is that it came back with KitKat and unrooted which means I have to wait for a working root procedure for it unlike with JB (I'm not afraid to root it again since I know what messed it up before was custom recovery TWRP version 2.6.3.2 that doesn't support KitKat lol).
hyelton said:
DId you not try and go back to stock?...
http://forum.xda-developers.com/showthread.php?t=2432476
Click to expand...
Click to collapse
He can't get into download mode which means no KDZ flashing.
MDA400 said:
If you can't boot into stock recovery (vol down + power key) and can't get into download mode (this is where they detect root once FW update shows up and the bottom left corner says Bootloader: ROOTED) then you can rest assure as long as you are under warranty, send it in to LG directly.
Do not send it to Verizon as you may incur charges for replacement. There's insurance from Verizon, but the real "replace with no charge" warranty is sending it to LG directly. Make an account on their website, register your G2, and make a Repair request by online chat or phone.
I just got my T-mobile G2 back after 2 weeks with the same issues and while it took a while to get repaired, I didn't pay a penny and it works without T-Mobile ever knowing its different hardware (all they replace is the flash memory that is corrupted in the phone).
Only downside is that it came back with KitKat and unrooted which means I have to wait for a working root procedure for it unlike with JB (I'm not afraid to root it again since I know what messed it up before was custom recovery TWRP version 2.6.3.2 that doesn't support KitKat lol).
He can't get into download mode which means no KDZ flashing.
Click to expand...
Click to collapse
Not getting into download mode is odd especially for just accepting a OTA update. Remember since they accepted the OTA its gonna take a special way of getting into download mode as the phone will be constantly on in boot loop. not all of the time but most of the time when people say they cant get into bootloader they have to keep trying due to the phone has to be "Turned off" OR rebooted at the same time of holding down the key combo.
hyelton said:
Not getting into download mode is odd especially for just accepting a OTA update. Remember since they accepted the OTA its gonna take a special way of getting into download mode as the phone will be constantly on in boot loop. not all of the time but most of the time when people say they cant get into bootloader they have to keep trying due to the phone has to be "Turned off" OR rebooted at the same time of holding down the key combo.
Click to expand...
Click to collapse
To get the phone to turn off, one has to reboot the phone (power key for 10 seconds) while holding volume up WITHOUT having the USB cable plugged in.
Recovery mode is a bit trickier by having to hold the power key for 10 seconds, then just as the phone reboots, hold PWR + VOL DWN and while holding VOL DWN, release PWR and press it again (gets to that factory reset screen where you press PWR 3 times).
Not trying to teach you this if you already know how, just stating it if the OP looks at this then he can try again with the above.
Also, Download mode is essentially the "bootloader" and it is locked meaning unless you have certified software (KDZ FW updater), you can't adb anything just in download mode unlike some LG phones that have emergency mode which is unlocked bootloader.
MDA400 said:
To get the phone to turn off, one has to reboot the phone (power key for 10 seconds) while holding volume up WITHOUT having the USB cable plugged in.
Recovery mode is a bit trickier by having to hold the power key for 10 seconds, then just as the phone reboots, hold PWR + VOL DWN and while holding VOL DWN, release PWR and press it again (gets to that factory reset screen where you press PWR 3 times).
Not trying to teach you this if you already know how, just stating it if the OP looks at this then he can try again with the above.
Also, Download mode is essentially the "bootloader" and it is locked meaning unless you have certified software (KDZ FW updater), you can't adb anything just in download mode unlike some LG phones that have emergency mode which is unlocked bootloader.
Click to expand...
Click to collapse
Yea I know the commands, The guide for going back to stock was created by me for the G2 haha, Hopefully the OP will see your post and try that
ive tried
ive tried factory reset "vol down & power"...its just goes black and stays the same
I'm having about the exact same problem. I rooted my phone a while back, I left it stock and just used some modules (xposed). When I noticed the update I of course was stupid enough to hit the update... My phone is doing the same as his. I can get to the factory reset screen but even if I go through there I get the same black screen (though backlit). I can't boot into download. I'm downloading the .tot needed for stock, but I'm not sure if that'll be a lot of good without download mode. I have everything on my phone backed up from when I rooted it (I'm missing a few pictures but nothing major.) Any and all help would be appreciated. I've got a bunch of precalc homework and Prom in a couple days so I'm willing to sacrifice sleep tonight. Thanks! (Made this account just for this, though I've used the site a bit before.)
xdavelope said:
ive tried factory reset "vol down & power"...its just goes black and stays the same
Click to expand...
Click to collapse
It's cuz you're not doing it correctly.
Yes, you're supposed to depress "vol down & power" but once you see LG logo, let go of both buttons and then immediately hold down only the "power" button.
After a few secs, a white factory reset screen will appear. Ignore the warning and press power button. I know, its kinda scary at first, but then phone will load into recovery.
I can get to the factory data reset screen but when i choose yes it just gives me the secure boot error. I am able to put my phone into download mode by pressing up volume and power when plugging to pc, but cant get pc to recognize it. I am sure I am missing something.
i am also bricked. i cant get into download mode or recovery. i have twrp installed, cant get to that either. i have tried every button combination and all i get is a black screen and vibrations, no lg logo. need help.
Dont
BAYOUREBEL said:
Did just like you with OTA today and now bricked. Guess I will have to call Verizon and see what they can do.
Click to expand...
Click to collapse
Call LG verizon will void your warranty
Has anyone made any progress or did all just send back to LG?
I am in similar shape, can get to the white factory reset screen - which does nothing once I accept.
I can also get into download mode, but the phone isn't recognized.
Wanted to confirm before I try to send it back that I can't fix myself.
Thanks!
Also, did anyone who was able to get back to the hard reset screen have luck sending to LG? Or did it have to be completely bricked?
Im also bricked. And there is no recovery mode. download mode is usable. but when i in twrp before brick i deleted efs because i have a back up after that recovery had corrupted and driver in the rom memory to talk to pc had also deleted with efs(i think). I have an idea to fix but im not sure
If I can change rom from mainboard and replace it other rom from other lg g2? Will it solve my and our problem??????
thanks to reply.

[Q] Cant get into download / recovery mode

Is there any other way to get to the download / recovery mode without the JIG while stuck in a bootloop? Because I cant really wait for one to ship to me nor even make one myself.
Thank you for all answers
[THE LONG STORY]
I've been using official ROM just like usual. Then the phone [GT-i9500] suddenly restarts itself and stuck in a bootloop.
I've tried entering both recovery / download mode [vol+home+pwr with the sim and sd card removed] - nothing worked. More specifically, after I press 'continue' to the download mode there comes up the GT-i9500 splash screen. I doubt that my keys are not working tho.
What's funny is that, by the way home, I took the phone to the Samsung service center. While pretending to be just another dumb user, they plugged in a USB JIG and the download screen came up like normal. And they tell me that the mobo is broken and want to take my money for the fix, bleh. Unquestionably, I declined that.

SoftBrick - stuck in recovery with LDU, please help!

Hey guys,
So recently I got a SM-G928X Live Demo Unit. I just read that flashing G928F firmware is completely fine and so I did aaaaand well, I am stuck in recover. Forgot to flash a custom recovery, also the phone has Factory Reset Protection so I am here with:
Android Recovery
MMB29K.G928FXXU2BPB6
samsung/zenbltexx/zenlte
6.0.1/MMB29K/G928FXXU2BPB6
user/release-keys
volume up/down and power
____________________
then goes normal recovery options
and at the bottom of the screen, there's
Supported API: 3
dm-verity verification failed...
Need to check DRK first...
Anyway I can't get to download mode, cant wipe data, cant flash from ADB/SD Card. When connected to PC no software recognises the device so yeah, that's a great situation to be in, right?
So if any of you have any idea how to make this thingy work again, I'm up for anything.
Thanks
Drasta1 said:
Hey guys,
So recently I got a SM-G928X Live Demo Unit. I just read that flashing G928F firmware is completely fine and so I did aaaaand well, I am stuck in recover. Forgot to flash a custom recovery, also the phone has Factory Reset Protection so I am here with:
Android Recovery
MMB29K.G928FXXU2BPB6
samsung/zenbltexx/zenlte
6.0.1/MMB29K/G928FXXU2BPB6
user/release-keys
volume up/down and power
____________________
then goes normal recovery options
and at the bottom of the screen, there's
Supported API: 3
dm-verity verification failed...
Need to check DRK first...
Anyway I can't get to download mode, cant wipe data, cant flash from ADB/SD Card. When connected to PC no software recognises the device so yeah, that's a great situation to be in, right?
So if any of you have any idea how to make this thingy work again, I'm up for anything.
Thanks
Click to expand...
Click to collapse
Hey, how comes you can not get into download mode? In case; do you know how to get into DL mode with the button combination?
Konsstantine34 said:
Hey, how comes you can not get into download mode? In case; do you know how to get into DL mode with the button combination?
Click to expand...
Click to collapse
Thing is there is this FRP thing and since I flashed a stock ROM it somehow blocks it from reseting the phone and even if I try to boot to download mode thru the button comb or thru the recovery, it just resets the phone and then boots to recovery immediately. Also this thing is preventing me from flashing anything from the SD card or ADB.
Drasta1 said:
Thing is there is this FRP thing and since I flashed a stock ROM it somehow blocks it from reseting the phone and even if I try to boot to download mode thru the button comb or thru the recovery, it just resets the phone and then boots to recovery immediately. Also this thing is preventing me from flashing anything from the SD card or ADB.
Click to expand...
Click to collapse
The guys were avoiding this issue by flashing the firmware. Since you can't boot into DL mode, that's odd. Maybe smart switch(or whatever it's name) helps. As far as i remember this lock is related with ''OEM Unlock'' in Settings » Developer options. Also there were some tricks around which you should research it at xda or youtube. Good luck.
Konsstantine34 said:
The guys were avoiding this issue by flashing the firmware. Since you can't boot into DL mode, that's odd. Maybe smart switch(or whatever it's name) helps. As far as i remember this lock is related with ''OEM Unlock'' in Settings » Developer options. Also there were some tricks around which you should research it at xda or youtube. Good luck.
Click to expand...
Click to collapse
I had no problem getting into DL mode but then I flashed the stock firmaware for G928F because I found here on XDA that it is completely fine flashing it onto G928X and since then it just boots to recovery and everything else just doesnt work. Pitty. Will try the USB JIG thing and will see..
hi
just flash in odin cf-autoroot
from recovery dont go to bootloader go to powerdown first
i had similar problem with LDU
---------- Post added 18th October 2016 at 12:09 AM ---------- Previous post was 17th October 2016 at 11:58 PM ----------
if cant put in dowwnload mode that way tray to push volume down+power off butons
after 15 sec or more screen goes off quickly push + home buton
sorrry for bad english

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