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So I'm trying to downgrade my tablet back to 3.2.1 from the ICS leak so i can have custom recovery again. and I've tried to get it into APX mode 5million times! I'm beginning to think I'm stupid! please help!
This is what I'm following
1. Turn off the ICONIA TAB by long pressing the power button for 5 seconds.
2. Use a paperclip to push the reset button, don't release it.
3. Press the power button for 3 seconds.
4. Release the power button
5. Wait for 1 sec and take out the paperclip.
LOL just got it after posting this Sorry and me being a newb to the forum I don't know how to delete it!
If you need to use APX anyway, then why not just flash modified ICS bootloader, which allows you to flash anything you want? Why go back to HC bootloader just for that? All the new ROMs will stop supporting HC bootloader eventually.
This is a painful message to write, but I am desparate. This should be so simple!
Have a U8800 standard (at least it says only "U8800" in settings/about phone.
What have I done:
- Upgraded some time ago to 2.3.5 Rev B522 from Huawei.
- Then rooted it with SuperOneClick.
- Installed ClockWorkMod from Play Store.
- Downloaded CWM Recovery 5.5.0.4 stable from xda and placed the file into the /.cust-backup/image folder via Remount.
- Turned off Fast boot under settings/applications
:: What worked/happened.
- Rooting went fine, ES file explorer and others get root-permissions ok.
- But got into CWMRecovery only via CWM program (Choosing "Reboot into recovery"). Never with the holding buttons vol+ and power-button during power-on.
Figured it was that locked bootloader on B522 that was the problem.
What I did:
- Followed the instructions in http://forum.xda-developers.com/showthread.php?t=1457490 (Get your pink screen back).
- In CWM Recovery flashed "update-B518-bootloader.zip".
- Got "ok installed or something to that effect" from CWM Recovery.
:: What worked/happened.
- Still could not get into CWMRecovery via button-holding. Tried reflashing the B518 bootloader a few times, but just no difference.
Read somewhere that each Huawei firmware-release comes with it's own bootloader, so lets try to install Huawei B518.
- Only place I could find the image was here http://huaweiideosx5.blogspot.no/2012/03/u8800-b518-23-software.html
- U8800V100R001C00B518G001.zip
- Had to take out the external SD-card to get the /sdcard/dload directory on the internal SD-card.
-Seems to be important to have dload on the internal SD-card and not the external.
- Booting the phone with vol+, vol-, power did not start the downgrade, but was able to trigger it via settings/storage/software upgrade.
After downgrade to B518 (Checked version in settings/about phone):
- Deleted /sdcard/dload directory.
- Rooted with SuperOneClick
- Installed ClockWorkMod from play store again.
- Put CWM Recovery 5.5.0.4 into ./cust_backup/image again (think this was unecessary. I think it was already there but did it anyways)
- Turned off Fast boot under settings/applications.
:: What worked/happened.
- The phone is now in B518 software, but still can not get into CWM Recovery via keypressing at boot.
I hold the vol+ and power-buttons all the way to "desktop" so to say, but can not for the life of me get into CWM Recovery that way. Getting into CWM recovery 5.5.0.4 via instructing CWM application to boot into recovery works fine, though.
I am drooling at the thought of ICS Aurora, but I don't dare before I can reliably get into CWM Recovery via keypress.
Sorry if this is very stupid post, but I have tried so much.
Maybe the volume buttons are faulty? Turn off the phone and try this: hold down volume up; while holding press power button as long as the logo comes up. Release power button but continue holding volume up. If it did not work, try doing same with volume down.
Yeah, do what Blefish advised you but do it while the phone is off and charging. I have a kinda broken power key and with this 'trick' it boots faster and more reliable. Keep holding the 3 buttons until you see the recovery.
Sent from my U8800
Thank you both for trying to help me here!
Unfortunately I have had no luck with your suggestions.
Re: Broken keys.
Power and volume-buttons seems to work well when the phone is on. Also when I boot into recovery through the CWM program, navigate to advanced/key-test, the vol+, vol- and power button seems to work well there too.
On pressing the power-button, CWM-R reports Key: 116
On pressing the vol+-button, CWM-R reports Key: 115
On pressing the vol--button, CWM-R reports Key: 114
So I think the keys must be ok, right?
Blefish: I did what you suggested, as I understood it.
When the phone boots, there are three stages of logos.
1. A static logo of Huawei's red "fan?".
2. A short "comet" animation.
3. An animated logo of Huawei's "fan", where some highlight flashes from left to right over the fan.
I hold the power-button in until I see the first static logo, then let go of the power-button and hold the volume-key(s).
Is this the same stage in the boot-process that you were thinking of?
I have tried vol+, vol- and both vol+ and vol-, together with releasing the power-button at that point.
Have not had any success with that, and ended on the "desktop" each time.
AceDroidX: I tried your suggestion as well.
I did this:
1. Shut down the telephone
2. Plugged in the power.
3. A "fan"-logo appears which is replaced by an animated battery.
4. Upon seeing the animated battery, I tried the various key-hold variants.
- vol+ and power : Ended up at desktop.
- vol- and power : Ended up at desktop.
- vol+ and vol- and power : Ended up at desktop.
So not much success either.
I am out of ideas... Can it be that B522 bootloader that still lingers in there, not replaced by installing the B518 software?
Well, idk what else to suggest.. Maybe your problem is here?
Downloaded CWM Recovery 5.5.0.4 stable from xda and placed the file into the /.cust-backup/image folder via Remount.
Click to expand...
Click to collapse
I remember that when i mount my phone in linux, there was a partition with just the image folder. Some files like boot.img and recovery.img where there. Try to put the recovery image in there and see if it makes any difference.
I'd like see your versioninfo, can you upload a screenshot?
You can check mine from B528
AceDroidX: When I use Remount, I am able to mount that partition as read/write so that I can copy CWM's Recovery image in there. I think it is identical as mounting it up remotely, as you do. I am after all able to boot into CWM-Recovery, just not by key-pressing? I suppose I could boot into Linux and try to mount up the partitions as you do.
Hi kilroystyx: I can not figure out where to find a similar-looking page as the one you have in your picture.
I have the settings/about phone, if that is an older version of what you have there?
Treq01 said:
Hi kilroystyx: I can not figure out where to find a similar-looking page as the one you have in your picture.
I have the settings/about phone, if that is an older version of what you have there?
Click to expand...
Click to collapse
You have to dial *#*#2846579#*#*
Off.. I completely forgot about that place!
Here are the right screenshots.
What can you see from this?
Treq01 said:
Off.. I completely forgot about that place!
Here are the right screenshots.
What can you see from this?
Click to expand...
Click to collapse
Based on the screenshots your installation is fine.
Just one last shoot based on what AceDroidX says, with phone off press Vol+ and hold then connect USB cable to PC or charger and stay holding Vol+ then wait...wait and what you see?
hi all,
i'm using some ics roms and it seems ics supports natively vol++power button to take screenshots but it doesnt work for me... do you know if there are some custom ics rom where it will work?
thank you
Wow.. It is hard to believe.. but I have actually ... eventually found a way to get into that CWM-Recovery every time.
It is a combination of your suggestions.
I have been doing variations, trying to figure something out and eventually there is a method.
What I must do, on this phone, in order to get into CWM-R is this:
1. If the charging cable is in, then unplug first.
2. Turn the phone off.
3. Take out the battery and put it back in.
- This makes a difference on my phone, at least. I am not able to get into CWM-R wihtout taking the battery out first.
4. Press and hold Vol+
5. With Vol+ being pressed continously, insert the charging-cable.
6. Wait for the Fan-animation to finish and the "battery-charging" animation to start.
7. When the battery-charging animation is running and the screen eventually goes black, keep holding the Vol+ button for some time.
- Sometimes it works to keep holding the Vol+ button for only a second or two. Sometimes I must hold it up to 30 seconds.
7. Press and hold the power-button in addition to the Vol+
8. Wait for CWM-Recovery to start.
Thank you very much for your help.
Now I think I can try for ICS!
imsonica said:
hi all,
i'm using some ics roms and it seems ics supports natively vol++power button to take screenshots but it doesnt work for me... do you know if there are some custom ics rom where it will work?
thank you
Click to expand...
Click to collapse
Try Vol- and Power ON
1. Download LG Mobile support tool (https://docs.google.com/file/d/0B687GQAEIeHiX0ZSeHp2NlhhalU/edit)
2. Install it as a normal software
3. Once it is successfully installed, run the program
4. Put your tablet into Download Mode (make sure the device is Powered Off and Unplugged, Press and hold Volume Up + Volume Down, then Plug In a USB Cable)
5. Run the LG Mobile Support Tool program
6. Click on "Options -> Upgrade Recovery" on the upright corner
7. It should start downloading stock firmware right away
8. Wait for it ......
9. A flash will be performed right after Once it finishes downloading
10. Wait until the tablet reboots. Done!!!
You may need to do a factory reset If you stuck in a bootloop
-Power off the device
-Press and hold the Power button and Volume down button at the same time
-When the LG logo shows up, let go both of the two buttons for a second, and then press them again
-A Factory reset promote should be shown on the screen. Follow the onscreen instructions to perform a factory reset.
How big is the download from LG server; is this a full system image or just recovery?
wpbear said:
How big is the download from LG server; is this a full system image or just recovery?
Click to expand...
Click to collapse
It's about 1.4gb but you can use the flash tool instead just download the kdz then flash via flash tool
We can use Loki to bypass the bootloader, we just need the dev to port the tool to our device! All that needs to be done is for someone to provide the build number and a copy of the aboot partition to him in this thread: http://forum.xda-developers.com/showthread.php?t=2358871 - will do this once my device has arrived
This worked and brought me back to stock everything. Perfect for me to return to store. Thanks
Thank you very much ! My tablet not boot with the last slimkat build unofficial....
I only see the UK stock Rom in other threads, will this reset a US tab back to the stock Rom?
Hi, thank you for this tutorial.
I made a huge mistake flashing a 4.4.2 Kernel (http://forum.xda-developers.com/showthread.php?t=2617476) on my stock rooted rom (I misunderstood the instruction and thought it was stock-compatible...).
Consequently, my G Pad is not able to boot anymore, even in recovery mode.
After several attempts, I succeed in putting the G Pad in download mode and I followed the procedure described in post #1. During the downloading process, I was surprised that the G Pad "reboots" periodically, by staying in download mode. This didn't bother me until the next recovery step.
Indeed, during the S/W upgrade, this reboot leads to "losts phone connection" error and recovery failure... It seems to append every 2min30s.
Do you have any idea of why it happens or what is it ? Any trick to make the G Pad stay in download mode longer ?
Make sure your device is fully charged and turned off.
Simultaneously press and hold the power and volume down buttons.
When the LG logo shows up, release the power button only.
Now press and hold the power and volume up button while keeping your hold on the volume down button.
When the factory reset screen appears, release your hold on all buttons.
Press the power button to continue.
Press the power button again to confirm if you’re sure you wish to continue with the reset.
For the OP this is the true hard reset button combination!
Thank's for your advice r3stor3 ! :good:
You were right, my G Pad had indeed too low battery to recover, although it has been plugged all day to my laptop. So I charged it all night with the LG charger and tried the recovery process again in the morning (the one in OP #1, not the hard reset), and it worked !
Nonetheless, after recovery, the system display only 1% battery. But that's another story...
Have a nice day !
[Edit : Nevermind, after being fully discharged, it starts to charge again. Everything is fine now.]
I'd like to flash a custom recovery and cm11 on my LG g pad. I'm worried about my warranty. Does this methods would put my tablet back as day one in order to return it if I ever need to?
Envoyé de mon LG-V500 en utilisant Tapatalk
Black screen
I was as a fool to install this:
http://androidforums.com/esteem-all...w-get-out-clockworkmod-recovery-bootloop.html
after a cwm boot loop. Now it is dead, even doesnt start in download mode. Just black.
Its over, isnt it...
Gogolo2 said:
I was as a fool to install this:
http://androidforums.com/esteem-all...w-get-out-clockworkmod-recovery-bootloop.html
after a cwm boot loop. Now it is dead, even doesnt start in download mode. Just black.
Its over, isnt it...
Click to expand...
Click to collapse
Although I didn't try and flash what you did, I wasn't able to put mine into Download mode to recover it either and only received a black screen! Turned out it was just ridiculously low on charge. I knew it was 'working' because with a USB cable in to the PC and holding the power button on the tab it was making connect and disconnect noises. Your best bet is to plug it into the mains charger and hold the power and/or power + vol down (I'm not sure what worked, I did a combination) until you get an LG logo. when you get to that, let it charge fully. (You should see the battery logo on screen)
Shouldn't have a problem once it's fully charged.
jim380 said:
1. Download LG Mobile support tool (https://docs.google.com/file/d/0B687GQAEIeHiX0ZSeHp2NlhhalU/edit)
2. Install it as a normal software
3. Once it is successfully installed, run the program
4. Put your tablet into Download Mode (make sure the device is Powered Off and Unplugged, Press and hold Volume Up + Volume Down, then Plug In a USB Cable)
5. Run the LG Mobile Support Tool program
6. Click on "Options -> Upgrade Recovery" on the upright corner
7. It should start downloading stock firmware right away
8. Wait for it ......
9. A flash will be performed right after Once it finishes downloading
10. Wait until the tablet reboots. Done!!!
You may need to do a factory reset If you stuck in a bootloop
-Power off the device
-Press and hold the Power button and Volume down button at the same time
-When the LG logo shows up, let go both of the two buttons for a second, and then press them again
-A Factory reset promote should be shown on the screen. Follow the onscreen instructions to perform a factory reset.
Click to expand...
Click to collapse
Wow this just saved my life!!!!!!!!!!!!!!!! :good::good::good::good::good:
Life saving!
r3stor3 said:
Make sure your device is fully charged and turned off.
Simultaneously press and hold the power and volume down buttons.
When the LG logo shows up, release the power button only.
Now press and hold the power and volume up button while keeping your hold on the volume down button.
When the factory reset screen appears, release your hold on all buttons.
Press the power button to continue.
Press the power button again to confirm if you’re sure you wish to continue with the reset.
For the OP this is the true hard reset button combination!
Click to expand...
Click to collapse
omg this saved my behind!!!!!!!!!!!!
flashed cm11
got stuck in boot loop
no recovery
no OS
no download mode
did this to factory reset and tada! im in recovery again!!!!
i love you man for posting such clear instructions to get into the hard reset with the hardware keys
hope this helps many
thanks for the info.
Tapatalk を使用して私の One から送信
When I try do the post #1, the message appears: "No upgrade itens to fix".
I try back the system date to december and the program recognize a upgrade, but it stop work.
Any suggestions?
wagneremanuel said:
When I try do the post #1, the message appears: "No upgrade itens to fix".
I try back the system date to december and the program recognize a upgrade, but it stop work.
Any suggestions?
Click to expand...
Click to collapse
Hi I have the same issue.. wondering how to solve it.. thanks
worldbreaker said:
Hi I have the same issue.. wondering how to solve it.. thanks
Click to expand...
Click to collapse
Me three. bricked my G pad and can't do the method outlined in the OP. I get that same error message: No Items To Fix
Please help!
Me too. No Items To Fix.
NYCguy2020 said:
Me three. bricked my G pad and can't do the method outlined in the OP. I get that same error message: No Items To Fix
Please help!
Click to expand...
Click to collapse
Was attempting to switch back to stock messaging app, and was using some old rom (mint jelly) with Titanium backup/rooted. I made the following changes :
unfreeze messaging app
restart bluetooth pairings
uninstall beauty face
uninstall best face
and then restarted my phone, and will not come back on? What the hell?
Will not enter recovery, at all. Just stays frozen on SAMSUNG. Not amused, please help if you can
Are you sure you are pressing the correct buttons? Volume UP + Power, when the device vibrates release the Power button and when 'Recovery Booting...' blue text appears release Volume UP button.
If you still can't enter the recovery mode there is only one option left: flash stock firmware with Odin!
jj
iJo09 said:
Are you sure you are pressing the correct buttons? Volume UP + Power, when the device vibrates release the Power button and when 'Recovery Booting...' blue text appears release Volume UP button.
If you still can't enter the recovery mode there is only one option left: flash stock firmware with Odin!
Click to expand...
Click to collapse
bah thanks, i looked at like 6 different "how to trigger recovery mode" and they were all wrong
its been months since i've done it so I'd completely forgotton
their method for download mode all worked fine, so i was worried
Damani311 said:
bah thanks, i looked at like 6 different "how to trigger recovery mode" and they were all wrong
its been months since i've done it so I'd completely forgotton
their method for download mode all worked fine, so i was worried
Click to expand...
Click to collapse
however there doesnt look like much i can do with recovery mode. the only backup is a year old and might as well be reflashing. is there some way to get into safe mode and maybe undo the changes i made in TitBackup?
To start Safe Mode you have to Power on the device with the Volume DOWN button pressed, until it boots up
I tried to root my phone S7 Edge 6.1.1 just a moment ago using ODIN and CF Auto Root. I got the PASSES! sign in ODIN but upon phone rebooting I am stuck on the Samsung S7 Edge logo screen with text in red 'Recovery Is Not Seandroid Enforcing" up the top.
At this time I am unable to turn my phone off, when I do it just turns back on and goes to the same screen. I can't get into download or recovery mode either.
Any help on how to fix would by greatly appreciated.
Thanks in advance.
Also thought I should add, my phone doesn't get registered when I connect it to my PC either, it wont show up in ODIN so I am unable to flash a stock recovery at this time.
It's trying to boot into recovery.
When you say you rooted with CF Auto Root, what did you do precisely? And did you follow Chainfire's specific instructions regarding the lack of screen output during the process?
Beefheart said:
It's trying to boot into recovery.
When you say you rooted with CF Auto Root, what did you do precisely? And did you follow Chainfire's specific instructions regarding the lack of screen output during the process?
Click to expand...
Click to collapse
Thanks for the reply.
I used CF-Auto-Root-zerolte-zeroltexx-smg925f.tar to root.
The steps I used was to simply put my phone into download mode and use ODIN to flash the file mentioned above. That is as far as I got unfortunately. I did this once before, a few month back when I first got the phone with no issues. I remember having to install TWRP but I couldn't remember if I did that pre-root or post-root. But I think that is where I went wrong.
Now I am unable to do anything with my phone. I can't turn it off, get into download or recovery mode. When I hold down VOL UP+POWER+HOME it just resets the phone back to the samsung logo screen.
Any ideas on what I could do?
You used the CF Auto Root file for an S6 Edge.
Beefheart said:
You used the CF Auto Root file for an S6 Edge.
Click to expand...
Click to collapse
OH GOD. You're right. I just realized that. I was supposed to have them saved into their own folders but I guess I saved that one too the wrong folder.
So what does that mean for the life of my phone then? Is it toast or is it recoverable somehow?
What is your model? Is it the SM-G935F? If so, first things first, download the correct CF Auto Root file for your device (here) and try again. Press VOL DOWN+POWER+HOME and it should reboot into Download Mode. Then try to flash the correct file in Odin again.
These phones are very difficult to hard brick, especially with something like CF Auto Root so you should be ok.
Beefheart said:
What is your model? Is it the SM-G935F? If so, first things first, download the correct CF Auto Root file for your device (here) and try again. Press VOL DOWN+POWER+HOME and it should reboot into Download Mode. Then try to flash the correct file in Odin again.
These phones are very difficult to hard brick, especially with something like CF Auto Root so you should be ok.
Click to expand...
Click to collapse
Thanks.
Yes, it is a SM-G935F. Unfortunately I am unable to reboot the phone into Download Mode. When pressing VOL DOWN+POWER+HOME it just takes me straight back to the Samsung logo where it says "Recovery Is Not Seandroid Enforcing". I'm hoping that once the battery drains completely I will be able to boot into Download Mode again.
Try simply resetting it instead. Press volume down and the power key (don't press home) for around 7-10 seconds. Once it starts to reset, remove your fingers from the buttons very briefly then press volume down, home and power to enter download mode.
Beefheart said:
Try simply resetting it instead. Press volume down and the power key (don't press home) for around 7-10 seconds. Once it starts to reset, remove your fingers from the buttons very briefly then press volume down, home and power to enter download mode.
Click to expand...
Click to collapse
That hasn't worked either unfortunately.
I just found this thread from a guy having a similar problem. He just had to wait for his phone's battery to drain completely and then he was able to enter download mode again.
You shouldn't have to though. If you can get the phone to reset at all (even if it's to make another attempt to go into recovery) then providing you time it right, you should be able to get into download mode. Did keeping your fingers on just the volume down and power buttons do anything? Keep them on continuously for up to 20 seconds and see what happens. Did you say pressing vol up & home & power made it reset and try to again get into recovery? What happens if, as soon as the screen indicated it's resetting, you remove your fingers and quickly press vol down & home & power instead?
Anyway, even if you have to wait until the phone dies, getting into download will be possible eventually. Then worst case scenario would be you having to reflash stock back. Or, as would be my preference, flash TWRP then flash a custom rom zip like Superman.
Just to confirm, I take it you selected OEM Unlock in dev options?
Beefheart said:
You shouldn't have to though. If you can get the phone to reset at all (even if it's to make another attempt to go into recovery) then providing you time it right, you should be able to get into download mode. Did keeping your fingers on just the volume down and power buttons do anything? Keep them on continuously for up to 20 seconds and see what happens. Did you say pressing vol up & home & power made it reset and try to again get into recovery? What happens if, as soon as the screen indicated it's resetting, you remove your fingers and quickly press vol down & home & power instead?
Anyway, even if you have to wait until the phone dies, getting into download will be possible eventually. Then worst case scenario would be you having to reflash stock back. Or, as would be my preference, flash TWRP then flash a custom rom zip like Superman.
Just to confirm, I take it you selected OEM Unlock in dev options?
Click to expand...
Click to collapse
I have never had any trouble getting into recovery or download before so I know the method. But just the properly clarify for you I will explain some of the combination I have tried without success. Bare in mind the phone is constantly turned on and idles on the Samsung logo.
I have tried:
Hold VOL DOWN+POWER+HOME, the phone resets and goes back to the logo.
Hold VOL DOWN+POWER, same as above.
Hold VOL UP+POWER+HOME, nothing happens at all.
Hold VOL UP+POWER, same as above.
Hold VOL DOWN+POWER+HOME, release and repress all on black screen, just goes back to logo.
Hold VOL DOWN+POWER, release and hold VOL DOWN+POWER+HOME on black screen, just goes back to logo.
and numerous other things like random combination to try and enter Download or Recovery mode, which have all failed.
Right now it's just stuck on the Samsung logo and staying there, taking forever to drain battery. I work in the morning so hopefully it is dead by then and I can get into Download mode.
Have already started download stock firmware in hopes that I will be able to flash it after.
Thanks a bunch for your help. If you think of anything else I might be able to try let me know!
Oh wow. 100+ attempts and I followed your last post about holding for up to 20 seconds. I was waiting ~5 seconds and releasing thinking that it hadn't worked.
Finally go into Download mode and will flash stock firmware and let you know how I go.
Thanks again! I owe you a cold one.
EDIT: Was no need to flash stock firmware. Just flashed the proper version of CF Auto Root and it worked. Again, thank you so much!
Fantastic. Hope you get it sorted.
On a side note, you have probably already tripped knox and you will have lost you OS data and possibly even what you have stored on internal storage. If so, I suggest you install TWRP, format data (you will lose everything with this but it removed encryption) and install a custom rom like Superman 1.9 from your external SD. It's better than plain stock and comes pre-rooted with plenty of other mods.
I can't get it to work? What keys did you held down?
This is how my screen looks
cs5-2.4pda.to/7951347.jpg (copy this link in browser)
I tried to root with Odin but I think I might have failed. How can I undo this?
recovery is not seandroid enforcing
hello,
my S7 Edge was rooted with cf-auto-root and worked fine but after 2 monthe I've installed LBE_Security_Rel_6.1.1928_A1_DE_v5_signed and reconized the message device is not tooted.
I was not very clever and cofirmed the question "fix the root problem" I don't remember exactly the words. After that root was gone.
I've flashed the stock Fw G935FXXU1APD1_G935FDRE1APC3_DRE but I still have the message "recovery is not seandroid enforcing" after trying to root with CF auto root.
AP:G935FXXU1APD1
CP:G935FXXU1APD1
CSC:G935FDRE1APC3
Is there any way to get root again
Any help on how to fix would by greatly appreciated.
Thanks in advance.
doodlemeat said:
I can't get it to work? What keys did you held down?
This is how my screen looks
cs5-2.4pda.to/7951347.jpg (copy this link in browser)
I tried to root with Odin but I think I might have failed. How can I undo this?
Click to expand...
Click to collapse
Simply hold down Home + Power + Volume Down for 10-15 seconds - don't release when the phone initially reboots and gives the same error, keep them held down and download mode will appear. I have to hold for 11 seconds, a strangely unrounded number.
Hello Guys I have this Same issue Yesterday....... This happens when you flash outdated CF Autoroot. CF Autoroot Updated on 25/08/2016... Download it...
Fix for Stuck in Logo Screen
Just Click and Hold ...... Vol Down + Menu + Power Keys ...... DO NOT RELEASE. IT Will Restart. DONT release. It will restart again and you will be download mode.
i found this during the rooting process. its a bit different to older samsungs on the s7 / s7edge. YOU HAVE TO KEEP HOLD OF VOL DOWN + HOME + POWER until it enters download mode, which can be 20-25 seconds