LG G4c half bricked. Can't connect with pc or start recovery mode. How to fix it? - LG G4c Questions & Answers

Hey guys. I tried rooting my LG G4c but after rebootingen it seems that my phone is stuck in a loop, and i can't fix it.
What happens when i turn the phone on:
1. LG logo turn up
2. The following message appears:
[670] --------------------------------------
[670]
[670] Boot verification fail!!
[670] - cause : MISMATCH_SIG_LEN
[670]
[670] --------------------------------------
3. Phone reboots
Using the power button + volume down does NOT work anymore to start recovery mode (although starting the IMEI display still works).
I tried using LG UP to install the original firmware via USB but the device does not show up in the list (probably because the phone keeps rebooting itself). Some website also said to connect the phone with the pc, turn LG UP on, then put out the battery and put it back in to make it work, but that also didn't work.
Anyone know what i can try next? What method can i use to reinstall the firmware? And if it's not possible, does it cost much to repair and who should i ask?
Edit: It seems i can start "Factory data reset" but when this proces starts the phone restarts and continues the loop with the error message.
I also tried connecting the device with LG UP while the phone is stalled on the IMEI screen and the Factory data reset screen. This way the phone does note restart itself and it might appear in the device list of LG UP. But too bad it still didn't work.

I don't know if i'm reaching anyone who can help me, but even a answer from anyone saying that the problem is hard to deal with would already be very relieving I really can't find anything related to this problem on the internet and i'm noobish myself. I'm probably gonna visit a some phone shop down town in the next days because i really don't know what to do.

vanderplate said:
I don't know if i'm reaching anyone who can help me, but even a answer from anyone saying that the problem is hard to deal with would already be very relieving I really can't find anything related to this problem on the internet and i'm noobish myself. I'm probably gonna visit a some phone shop down town in the next days because i really don't know what to do.
Click to expand...
Click to collapse
I had this problem too. I send it to LG and said the phone was unplugged during update process. They flashed it and I gave it to my mom. I have an S4 yet. Much better performance and rom support.

download mode
vanderplate said:
I don't know if i'm reaching anyone who can help me, but even a answer from anyone saying that the problem is hard to deal with would already be very relieving I really can't find anything related to this problem on the internet and i'm noobish myself. I'm probably gonna visit a some phone shop down town in the next days because i really don't know what to do.
Click to expand...
Click to collapse
Can you get it into download mode?

Related

plzzzzzzzzz help with my dead gt540

i have lg gt540 and while updating to 2.1 with kdz tool the pc crashed now i cant turn on the phone...i hope some one help me with that
Have you tried updating again?
the problem the the phone dont open when i press power button there is nothing
what about when plugged into pc?
first thx for replying but there is nothing when i connect it to pc i think it needs abootloader.i hope u answer me
im afraid im pretty new to android ( gt540 is my first smartphone ) but anytime i updated, everything went ok, in fact yours is the first time i heard of a crash while updating so i cant give you much info but your in the right place, im sure the devs can figure something for you. just try remove the battery and then plug into your pc. and its not a problem replying just wish i could help.
well, did you try with the battery removed?
yes i did nd there is nothing
plz any one help in that
plz some one tell me how to make abootloader to it i have another lg gt540 i want to know if i can use it to repair the bootloader for this dead phone
The problem is theres noway u can acces inside the phone memory to patch bootloader. Go to lg waranty and tell them this happened when u were updating phone, dont tell them that pc crashed, tell them u updatet through lgsupport tool too, not through kdz updater they should fix it for u.
Sent from my GT540
thx for replying i will call them tomoorow i hope they will fix it for me... i want to ask if some one has passed with the same problem b4
Goto Emergency Mode, and upgrade from KDZ program. In KDZ program, you must setting Phone Mode to CS_Emergency. And flash agan.
i sent them email about the problem and this was the reply
Thank you for your email regarding this issue.
Unfortunately due to the nature of this issue, you will no longer be able to finish the update service. In this case you would be required to return to ourselves for servicing. To action this please contact the number below with your reciept and handset to hand.
If you have any further queries, please do not hesitate to contact us again.
Best regards,
LG Electronics UK Helpdesk
can any one tell me what should i do
Remove battery press volume - or + I can't remember try two options, then plug in usb.
You should see blue screen with DOWNLOAD or EMERGENCY MODE text.
i tried all keys combination nothing work
my mobile internet went dead after flashing quarx rom (I did it wrong btw...), but everything else worked fine.
I couldn't get mobile internet back on track no matter what (it was disabled in quick settings when I flashed quarx), I even tried factory reset and flashing the baltic rom. during the flashing, the kdz updater gave me an error close to the end, and my phone became stuck at the android screen.
even though I have CWR installed, so I could flash it again, I sent it to LG claiming I was updating through their website and since my phone doesn't start. I didn't tell them anything about the mobile internet not working. Hopefully they'll clean the phone completely and that will fix it.
I'll be picking up my phone after work today, I'll let you know how it went.
Same thing Happened to me n almost **** my pants for killing my brand new phone..
follow these steps
1. volume +or-(i dont remember) +camera n power on. it should turn on n say downloading mode.
2. update( you can use kdz updater, it probably wont crash this time but even if gets stuck just w8 for it)
3. after updating, remove the usb cable n turn on the phone, hopefully it would work
4. ENJOY ( N THINK TWICE BEFORE EFFING WITH THE PHONE, )
i am not sure about the keys for emergency/downloading mode(i think it was vol-) GOOGLE IT IF KEYS DONT WORK.
Put to microwave on 2 sec without battery and send do service
my service provider fixed my phone in 3 days without any issues, they flashed the t-mobile branded 2.1 on it. went home and now I have the open europe with fastboot and cwr.
so if all else fails, just send it to LG or your provider.
cheers!

Can Not even get into Download Mode

Initially i was able to get into Recovery Mode and was trap in Boot Loop but when i Flash a Rom from Dorky's with ODin 3 Even Boot Loop Goes away nothing appears except Black screen but can get into Download Mode
so tried another time with Odin 1.875 with some other Rom Odin first detected it and the when process Starts it gives error failed i restart process and nothing happens i took off the battery and replaced it and tried to get into Download Mode but nothing Happens:crying::crying::crying:
Galaxy Y s5360
Please help, u can help!!
xhizors111 said:
Initially i was able to get into Recovery Mode and was trap in Boot Loop but when i Flash a Rom from Dorky's with ODin 3 Even Boot Loop Goes away nothing appears except Black screen but can get into Download Mode
so tried another time with Odin 1.875 with some other Rom Odin first detected it and the when process Starts it gives error failed i restart process and nothing happens i took off the battery and replaced it and tried to get into Download Mode but nothing Happens:crying::crying::crying:
Galaxy Y s5360
Please help, u can help!!
Click to expand...
Click to collapse
Start calm.
All you need is a cool mind now.
Search for the USB JIGGS available on xda and see if someone from your area has it. You can then take help from that person. If not then just go to service center, tell them that it stuck like this while doing software update and act like you no nothing about rooting our flashing. That will do.
A Hero Can Be Anyone. GENERAL HELP THREAD
Is is still repairable
Bruce Wayne said:
Start calm.
All you need is a cool mind now.
Search for the USB JIGGS available on xda and see if someone from your area has it. You can then take help from that person. If not then just go to service center, tell them that it stuck like this while doing software update and act like you no nothing about rooting our flashing. That will do.
A Hero Can Be Anyone. GENERAL HELP THREAD
Click to expand...
Click to collapse
I am not thinking to use a jigg as even after i get into Download mode incase after jigg i would definately make situation more worse
is it repairable, when i connect it with Cable i can see it is searching for drivers so its not completely gone i guess,
will service center guys will able to repair it??
xhizors111 said:
I am not thinking to use a jigg as even after i get into Download mode incase after jigg i would definately make situation more worse
is it repairable, when i connect it with Cable i can see it is searching for drivers so its not completely gone i guess,
will service center guys will able to repair it??
Click to expand...
Click to collapse
Yes, offcouse.
Just let them be unaware of you knowing about root/cwm etc. just act dumb. If they get to know your warranty is already void, they will charge you money for repairing it.
Follow what bruce says..
Tell them u got an update in kies nd this happened
** rooting is new for me,
nd i am a noob to root....**
They said Board is damaged
They are saying board is damaged!
price to repair it is more than its second hand value in market
i took it from their and brought it home
i remember before giving them when i connect usb cable to it unknown device found is detected but now its not even showing that
i am developer guy so not a completely noob
i want to repair it not to replace its body parts
can someone help
please!
Please anyone!!
or do refer any book!
xhizors111 said:
They are saying board is damaged!
price to repair it is more than its second hand value in market
i took it from their and brought it home
i remember before giving them when i connect usb cable to it unknown device found is detected but now its not even showing that
i am developer guy so not a completely noob
i want to repair it not to replace its body parts
can someone help
please!
Click to expand...
Click to collapse
The last 'n' only hope left is this:-
Install ur phone specific driver on pc.
1. Take out battery, sim & sd card.
2. Open odin.exe on pc.
3. After this, connect the phone via USB cable to PC(yes! without battery,sim & sd card)
4. Press the download mode combo keys.
5. While keep pressing all those keys, insert the battery now.
6. Now, odin should detect ur phone so that u may get it updated with stock firmware.
And if this also doesn't work, then bro u might have lost it at all
Sent Via XDA™ Premium

[Q] LG G2 D802 Trouble. Black Screen. No Recovery/Download Mode

Hello together!
I just got my new LG G2 D802 32gb today and wanted cyanogen on it. Well it was already rooted by the pre-owner so i just installed TWRP BUT I made the mistake to install it for D801 instead of D802. (Too hasty )
Well when the phone rebooted after the installation it stucked in fastboot and I was starting to freak out. I was searching for a solution but I just came from Apple to Android so its all kind of new. I saw this post and tried it.
reddit.com/r/lgg2/comments/1soiyj/stuck_in_fastboot_mode_need_help/
I erased the data as described. Worked just fine. Then I tried to flash the new data but it didnt work and after a while I restarted the phone (Why not I thought, usually always helps)
Well now the screen is, and stays, black. And it wont Turn on. No matter how long I press the Power Button. Also I cant access the Download nor the recovery mode. So I cant restock. When I connect the phone to my laptop it shows a crapload of drives on my laptop. From E to S everything. 15 Local Disks overall. Well just one of them is accessable. E:. On the drive is one single folder: Images. But its secured so I cant add anything to it (I hoped I could add the Images I just erased eralier manually). 63.9MB is its capacity.
Neither fastboot nor ADB can access the the phone now.
Pressing the Power Button of the phone while connected reconnects it to the computer.
I dont know what to do I am completely helpless :crying:
I appreciate every help!
Thanks!
Linus
Did you find a solution?
LinusFr said:
Hello together!
I just got my new LG G2 D802 32gb today and wanted cyanogen on it. Well it was already rooted by the pre-owner so i just installed TWRP BUT I made the mistake to install it for D801 instead of D802. (Too hasty )
Well when the phone rebooted after the installation it stucked in fastboot and I was starting to freak out. I was searching for a solution but I just came from Apple to Android so its all kind of new. I saw this post and tried it.
reddit.com/r/lgg2/comments/1soiyj/stuck_in_fastboot_mode_need_help/
I erased the data as described. Worked just fine. Then I tried to flash the new data but it didnt work and after a while I restarted the phone (Why not I thought, usually always helps)
Well now the screen is, and stays, black. And it wont Turn on. No matter how long I press the Power Button. Also I cant access the Download nor the recovery mode. So I cant restock. When I connect the phone to my laptop it shows a crapload of drives on my laptop. From E to S everything. 15 Local Disks overall. Well just one of them is accessable. E:. On the drive is one single folder: Images. But its secured so I cant add anything to it (I hoped I could add the Images I just erased eralier manually). 63.9MB is its capacity.
Neither fastboot nor ADB can access the the phone now.
Pressing the Power Button of the phone while connected reconnects it to the computer.
I dont know what to do I am completely helpless :crying:
I appreciate every help!
Thanks!
Linus
Click to expand...
Click to collapse
Did you get an answer? Same problem for me
Bob the tomato said:
Did you get an answer? Same problem for me
Click to expand...
Click to collapse
same here any solution.
This is for the d802 variant with 16Gb,
but the procedure is this: http://forum.xda-developers.com/showthread.php?t=2582142
LinusFr said:
Hello together!
I just got my new LG G2 D802 32gb today and wanted cyanogen on it. Well it was already rooted by the pre-owner so i just installed TWRP BUT I made the mistake to install it for D801 instead of D802. (Too hasty )
Well when the phone rebooted after the installation it stucked in fastboot and I was starting to freak out. I was searching for a solution but I just came from Apple to Android so its all kind of new. I saw this post and tried it.
reddit.com/r/lgg2/comments/1soiyj/stuck_in_fastboot_mode_need_help/
I erased the data as described. Worked just fine. Then I tried to flash the new data but it didnt work and after a while I restarted the phone (Why not I thought, usually always helps)
Well now the screen is, and stays, black. And it wont Turn on. No matter how long I press the Power Button. Also I cant access the Download nor the recovery mode. So I cant restock. When I connect the phone to my laptop it shows a crapload of drives on my laptop. From E to S everything. 15 Local Disks overall. Well just one of them is accessable. E:. On the drive is one single folder: Images. But its secured so I cant add anything to it (I hoped I could add the Images I just erased eralier manually). 63.9MB is its capacity.
Neither fastboot nor ADB can access the the phone now.
Pressing the Power Button of the phone while connected reconnects it to the computer.
I dont know what to do I am completely helpless :crying:
I appreciate every help!
Thanks!
Linus
Click to expand...
Click to collapse
HI, after two damned weeks, i decided to send my G2 to the service center, they said that they have to replace the board, luckily for me i still have the warranty for my phone, we have same problem, and even this cant unbrick my phone http://forum.xda-developers.com/showthread.php?t=2582142 sorry to tell you that theres no other way around to fix your G2 but to send it to the HOSPITAL.
hey try this
http://forum.xda-developers.com/showthread.php?p=48765620#post48765620
i got ur problem tooo after I got upgrade to lolipop but i got greedy and try cyanogen 13
mannnnnnnnnn black sceen of death!!
Maybe @tungkick can help here. He helped me with my G2 16GB with this problem.
This is qhs_USB 9006 use srktool to unbrick u can find it here in xda
ThePainlessOne said:
http://forum.xda-developers.com/showthread.php?p=48765620#post48765620
i got ur problem tooo after I got upgrade to lolipop but i got greedy and try cyanogen 13
mannnnnnnnnn black sceen of death!!
Click to expand...
Click to collapse
Same here

LG Flash Tool crashed while flashing, phone bricked

Hi,
I was about flashing stock rom (following this thread and using CSE Flashing mode), when suddenly LG Flash Tool crashed on windows (I hate windows). Flashing progress stuck at 16%, so I press and hold power button to power phone off. but when I tried to enter to Download Mode, phone start too boot, and after LG logo, screen keeps going on and off (showing black screen)
I tried to enter to recover or factory hard reset, but it going to Factory data reset, even if I confirm reseting data it would try to boot same as when I tried to get Download Mode.
adb does not work
I followed this thread, but /dev/sdb1..36 just available for a few second and then disappear, after a while they are available and then disappear, and this will going on, (I think this is related to that screen on and off thing)
Would someone help me?
Sorry for my bad english, I'm a little nervous right now
Ok, finally I could see sdb1...36 and do what have been said here, and now I stuck at LG logo at boot.
still cannot get the download mode
factory hard reset is back but it'll stuck at "Factory reset processing..."
I have really lost my respect to flashtool after this kind of errors. If someone solve that issue it would be great for our community
please help
IM SORRY
we have the same scenario before, identically as yours.. and im sorry to tell you that you bricked your G2 so bad. i need to take mine to service center and they said that it needs the board to be replace, luckily im still on warranty. hope you still have yours as well
berceniqgil said:
we have the same scenario before, identically as yours.. and im sorry to tell you that you bricked your G2 so bad. i need to take mine to service center and they said that it needs the board to be replace, luckily im still on warranty. hope you still have yours as well
Click to expand...
Click to collapse
Yes I'm still have warranty.
But I hope I can fix it myself
Mine just got this issue too. Repair center denied the phone for repairs, claiming it is user damage.
So yup, I have a neat paperweight now.
berceniqgil said:
we have the same scenario before, identically as yours.. and im sorry to tell you that you bricked your G2 so bad. i need to take mine to service center and they said that it needs the board to be replace, luckily im still on warranty. hope you still have yours as well
Click to expand...
Click to collapse
Zulake said:
Mine just got this issue too. Repair center denied the phone for repairs, claiming it is user damage.
So yup, I have a neat paperweight now.
Click to expand...
Click to collapse
Somewhere in the forum i saw that you can detect your phone as a adb device on ubuntu or etc. Have you tried that? Im really feeling sorry about hearing that issue. As advice use old flashtool method that is harder but safer
abdulkadiro said:
Somewhere in the forum i saw that you can detect your phone as a adb device on ubuntu or etc. Have you tried that? Im really feeling sorry about hearing that issue. As advice use old flashtool method that is harder but safer
Click to expand...
Click to collapse
Ubuntu is running in a VM, so I would need Windows to find the phone first.
Unfortunately, Windows never sees the phone.
It's weird though. TWRP got successfully flashed during the QHSUSB_BULK guide method, but I cannot boot into it.
Zulake said:
Ubuntu is running in a VM, so I would need Windows to find the phone first.
Unfortunately, Windows never sees the phone.
It's weird though. TWRP got successfully flashed during the QHSUSB_BULK guide method, but I cannot boot into it.
Click to expand...
Click to collapse
Maybe you had a bad download try an another base
abdulkadiro said:
Maybe you had a bad download try an another base
Click to expand...
Click to collapse
I lost QHSUSB_BULK mode now, the PC won't see the phone anymore and all modes are gone.
No download mode, no recovery, no ADB, no fastboot, factory reset freezes, nothing works.
Zulake said:
I lost QHSUSB_BULK mode now, the PC won't see the phone anymore and all modes are gone.
No download mode, no recovery, no ADB, no fastboot, factory reset freezes, nothing works.
Click to expand...
Click to collapse
If you see the lg logo maybe you will have a change. A guy who had the same results like you brings his phone plugged for 10-15 minutes than he have find his phone in download mode. Of course he plug the cable while holding the down button. I hope you will get your phone back with its functions
abdulkadiro said:
If you see the lg logo maybe you will have a change. A guy who had the same results like you brings his phone plugged for 10-15 minutes than he have find his phone in download mode. Of course he plug the cable while holding the down button. I hope you will get your phone back with its functions
Click to expand...
Click to collapse
Well, that's worth the try.
I just connected it while holding volume up.
Hopefully it will still charge when connected.
//Well, it's been about 15 minutes now and it still displays the LG logo.
Guess I'm outta luck on this one.
Zulake said:
Somewhere in the forum i saw that you can detect your phone as a adb device on ubuntu or etc. Have you tried that? Im really feeling sorry about hearing that issue. As advice use old flashtool method that is harder but safer
Click to expand...
Click to collapse
I tried that on my ubuntu laptop, ubuntu did not detect the phone
Zulake said:
Well, that's worth the try.
I just connected it while holding volume up.
Hopefully it will still charge when connected.
//Well, it's been about 15 minutes now and it still displays the LG logo.
Guess I'm outta luck on this one.
Click to expand...
Click to collapse
I read this post one more time, this guy who had download mode after 10-15 minute, have discharged the phone then do what he said. have you try that?
I have discharged my phone, but I'm going to work right now, later today I will try and let you know if it was fixed or not
Behzadsh said:
I tried that on my ubuntu laptop, ubuntu did not detect the phone
I read this post one more time, this guy who had download mode after 10-15 minute, have discharged the phone then do what he said. have you try that?
I have discharged my phone, but I'm going to work right now, later today I will try and let you know if it was fixed or not
Click to expand...
Click to collapse
I won't dare doing that, as it doesn't seem to charge anymore.
I'm gonna retry sending it in today, otherwise it's going into the bin.
I tried one more time last night when phone was fully discharged. nothing has been changed.
Zulake said:
I won't dare doing that, as it doesn't seem to charge anymore.
I'm gonna retry sending it in today, otherwise it's going into the bin.
Click to expand...
Click to collapse
Hopefully it start charging.

lg g2 trying to unroot

Hello all,
usually i deal with my problems by searching the forum, though this time i am really worried as i cant find anything to my help.
You see something went bad with the screen and because the phone is rooted, i cant get it fixed (it is still in warranty), nor can i use it (the touch sucks).
So i am trying to get it unrooted.
So i have downloaded LG mobile support tool and the drivers, i enter the phone to download mode and nothing happens. i get all the time errors. Also, in the lg mobile support tool, i see a software update. Should i do it? I cant though because the start upgrade button is greyed out, and the "LGD802" sign on the left pane is flushing like its trying to verify my g2. Also, should i wait for like 10 minutes or so when i enter download mode for the bar seen at the phone to be completed before the whole process? Lastly, the most of times the lg mobile support tool crashes on the pc.
Please help me folks... :/
spirios1992 said:
Hello all,
usually i deal with my problems by searching the forum, though this time i am really worried as i cant find anything to my help.
You see something went bad with the screen and because the phone is rooted, i cant get it fixed (it is still in warranty), nor can i use it (the touch sucks).
So i am trying to get it unrooted.
So i have downloaded LG mobile support tool and the drivers, i enter the phone to download mode and nothing happens. i get all the time errors. Also, in the lg mobile support tool, i see a software update. Should i do it? I cant though because the start upgrade button is greyed out, and the "LGD802" sign on the left pane is flushing like its trying to verify my g2. Also, should i wait for like 10 minutes or so when i enter download mode for the bar seen at the phone to be completed before the whole process? Lastly, the most of times the lg mobile support tool crashes on the pc.
Please help me folks... :/
Click to expand...
Click to collapse
Where did you buy it, it sounds like the symptoms of a frankenphone. There is a post about it, some sellers flash d802 firmware on a d800 and it causes similar problems with screen, IDK about the LG mobile flash tool.
.
3r4s3r said:
Where did you buy it, it sounds like the symptoms of a frankenphone. There is a post about it, some sellers flash d802 firmware on a d800 and it causes similar problems with screen, IDK about the LG mobile flash tool.
.
Click to expand...
Click to collapse
I bought it 1 year ago, although i immediately flashed cloudy's rom. i cant understand though why every now and then the screen becomes unusable.
spirios1992 said:
I bought it 1 year ago, although i immediately flashed cloudy's rom. i cant understand though why every now and then the screen becomes unusable.
Click to expand...
Click to collapse
If you are brave enough you could try taking it apart and swabbing all the conections, I don't know if that would help but some people say it helps them. And the screen could just be faulty, you never no, before I took it apart I would try reflashing rom, doing the stock touch firmware update thing, then if it still don't work try flashing a kdz for the model number physically inside your phone not the one in the system info, and then I would take it fully apart, and put it back together then if it don't work, replace the screen.
the thing is i cant really interact with the screen to reflash the rom, its inresponsive. and my lg mobile support tool randomly crashes i hook my phone up the pc and it starts the download drivers part
spirios1992 said:
the thing is i cant really interact with the screen to reflash the rom, its inresponsive. and my lg mobile support tool randomly crashes i hook my phone up the pc and it starts the download drivers part
Click to expand...
Click to collapse
Try a different computer, you could use a USB otg cable to hook a mouse up to your phone if your having issues with touch screen to reset it.
try in different pc and differenrt dll

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