Develop Bugs

[Q] Can't change into download mode LG G3 D855

Hey Guys,
I want to flash the stock rom on my LG G3 D855, but somehow lgflashtool cant change into download mode. I tried to flash with the .kdz file but it doesnt work either.
And now my phone is stuck in the firmwarte update screen. I cant do anything when I try to turn it on it just goes back into the firmware update screen. I tried to do the hardreset with the buttons but it doesnt work.
Can someone please help ?
EDIT: Hey guys I solved the problem by returning it to telekom (my carrieer) and they send me a new LG G3 on the next day. But when I tried to flash my G3 with the .kdz method I didnt put the .kdz file into the same folder as the LGFlashTool, maybe that was the reason why it didnt work.

Khoalition said:
Hey Guys,
I want to flash the stock rom on my LG G3 D855, but somehow lgflashtool cant change into download mode. I tried to flash with the .kdz file but it doesnt work either.
And now my phone is stuck in the firmwarte update screen. I cant do anything when I try to turn it on it just goes back into the firmware update screen. I tried to do the hardreset with the buttons but it doesnt work.
Can someone please help ?
Click to expand...
Click to collapse
did you install all the drivers needed?
http://forum.xda-developers.com/lg-g3/general/flashing-guide-to-lg-t2825369

vak20 said:
did you install all the drivers needed?
http://forum.xda-developers.com/lg-g3/general/flashing-guide-to-lg-t2825369
Click to expand...
Click to collapse
Yup tried everything.

Khoalition said:
Hey Guys,
I want to flash the stock rom on my LG G3 D855, but somehow lgflashtool cant change into download mode. I tried to flash with the .kdz file but it doesnt work either.
And now my phone is stuck in the firmwarte update screen. I cant do anything when I try to turn it on it just goes back into the firmware update screen. I tried to do the hardreset with the buttons but it doesnt work.
Can someone please help ?
Click to expand...
Click to collapse
I have the same Problem and I also have installed the drivers. please help

smiloradovic said:
I have the same Problem and I also have installed the drivers. please help
Click to expand...
Click to collapse
be sure NOT to use usb 3 port

my laptop has only usb 2 ports and i tried all usb ports and i get the error every time

smiloradovic said:
my laptop has only usb 2 ports and i tried all usb ports and i get the error every time
Click to expand...
Click to collapse
What method did you use?
If you used the .kzd method (http://forum.xda-developers.com/showthread.php?t=2785089) dont forget to put the .kdz file in the same folder as the LGFlashTool
If that doesnt work, you should go and replace it.

Khoalition said:
What method did you use?
If you used the .kzd method (http://forum.xda-developers.com/showthread.php?t=2785089) dont forget to put the .kdz file in the same folder as the LGFlashTool
If that doesnt work, you should go and replace it.
Click to expand...
Click to collapse
I solved it. I took a friends laptop and tried it on it. In 5 min we were done but thank you.

LG G3 Can't change to download mode
Khoalition said:
Hey Guys,
I want to flash the stock rom on my LG G3 D855, but somehow lgflashtool cant change into download mode. I tried to flash with the .kdz file but it doesnt work either.
And now my phone is stuck in the firmwarte update screen. I cant do anything when I try to turn it on it just goes back into the firmware update screen. I tried to do the hardreset with the buttons but it doesnt work.
Can someone please help ?
EDIT: Hey guys I solved the problem by returning it to telekom (my carrieer) and they send me a new LG G3 on the next day. But when I tried to flash my G3 with the .kdz method I didnt put the .kdz file into the same folder as the LGFlashTool, maybe that was the reason why it didnt work.
Click to expand...
Click to collapse
having same problem with my LG G3 D850 .... currently running on custom rom I want to install stock rom http://storagecow.eu/index.php?dir=Xda/LG+G3/Stock/AT&T+D850/
but it gives me error Can't change to download mode .... Can see in (picture)

Hard Bricked D850PR

So the story goes as this:
ATT G3 accidentally flashed a D851 rom... phone rebooted now its a hard brick
I have tried every method to restore it to stock (lg flashtool 2014 and old flash tool method, tried enter TWRP nothing happened)
My phone is detected as it were in Download mode, but it doesnt let me flash anything.
I downloaded the "generic" LGUP8794.dll and tried to flash stock D850 and stock D851, jeez I even tried to flash LS990 stock rom... same error every time.
Downloaded stock D850PR20A_01.kdz and tried to flash it through Flashtool 2014 and just getting error...
I'm really out of options now.
I dont have warranty so its out of question the "return my phone" thing.
Thanks in advance for any reply or suggestion.
PD: I get no "QHUSB" or "fastboot" mode either.

Try using a different usb port. LG flash tool hates USB 3.0 so use USB 2.0

speedyjay said:
Try using a different usb port. LG flash tool hates USB 3.0 so use USB 2.0
Click to expand...
Click to collapse
I have tried with 3 different computers, one with XP, Win7 and win8.1
I never use USB3.0 unless its with a memory stick

Can you go into download mode??
Sent from my SM-N910F using XDA Free mobile app

No, No Download mode, but my phone is connected as it were in download mode.
My screen is good, I know cuz when i connect the usb without battery it lights up and shows an image of "missing batt"
No TWRP either

Any update on this? I just rooted my D850PR and then used AutoREC to install TWRP, then I turned it off to reboot but it never booted...it also lights up the display when connecting the USB cable without the battery but that's all it does

gretschpr said:
Any update on this? I just rooted my D850PR and then used AutoREC to install TWRP, then I turned it off to reboot but it never booted...it also lights up the display when connecting the USB cable without the battery but that's all it does
Click to expand...
Click to collapse
Dos your computer recognize the phone as qhsusb_bulk?
Sent from my SM-G925T using Tapatalk

i cant believe there is no clear solution for the LG G3 brick.

There is a solution
I have faced this issue with my LS990. accidentally flashed D855 ROM then bricked. THere is a unbricking method which is very hard and you have to do it with patience.
Try this
http://forum.xda-developers.com/lg-g3/general/unbrick-lg-g3-qhsusbbulk-qualcomm-9008-t3072091
You might want to short 2 pins of G3 motherboard. message me if this method didn't work.
Good luck matehttp://forum.xda-developers.com/lg-g3/general/unbrick-lg-g3-qhsusbbulk-qualcomm-9008-t3072091

I had that problem, flashed d855 rom on a d850pr, and it went into bootloop, but I just went into recovery, flashed a D850 rom and everything worked fine. I did have your problem once, but with a LG Optimus L2, I tried on windows 8 and 7 but the LGflashtool always stop with errors, until I tried on XP, i could restore it. (sorry for the english)

Fixed hard brick LG G3
This post fix my hard brick problem with LG G3 D850PR:
https://forum.xda-developers.com/att-lg-g3/general/downgrade-lg-g3-d850-to-kit-kat-t3437524
The files I used:
https://dl.xda-developers.com/3/5/0/4/2/8/9/LGUP8974.zip?key=FPUbu3eormslai-eelpOBw&ts=1499518278
http://qc2.androidfilehost.com/dl/d...IN_LGD850AT-01-V10d-310-410-JUN-19-2014-0.zip
http://qc1.androidfilehost.com/dl/c...8065/95916177934528569/Setup_LGFlashTool.zip?

D855 MM Stuck at TWRP after flashing KDZ with LGUP

I dont understand why this happens because i follow the rules exactly.
I was using MM with TWRP+Root.(Not kingroot or other, just SuperSu 2.52) I was flashed .zip file from Xda. I mean i was using L and after that .zip files pops out for MM, i just simply flash the MM zip file and got it worked.
After flashing kdz file with LGUP now my phone stuck at twrp. Now i stuck at twrp. I tried to restore my backup on external_sd but didn't work either. Any ideas?

LG Up can't wipe twrp , so tried flashing again with LG Flashtool with lastest driver.

fOxunO said:
LG Up can't wipe twrp , so tried flashing again with LG Flashtool with lastest driver.
Click to expand...
Click to collapse
I was trying this but Lg Flash Tool Stuck at %60. I was not update LG Drivers maybe because of this. I dont know what to do now. What must i have to do?
http://i65.tinypic.com/2u4op37.jpg
Phone shows nothing but %0
Afterr battery pull and restarting the process with new drivers, now LG Mobile Support Tool says device is disconnected. I'm confused.

okanb3 said:
I was trying this but Lg Flash Tool Stuck at %60. I was not update LG Drivers maybe because of this. I dont know what to do now. What must i have to do?
http://i65.tinypic.com/2u4op37.jpg
Phone shows nothing but %0
Afterr battery pull and restarting the process with new drivers, now LG Mobile Support Tool says device is disconnected. I'm confused.
Click to expand...
Click to collapse
I had same problem with it being stuck at 60% what I did was not to press cancel or unplug but pressed retry and it worked. Also change the language to English and the question marks will disappear.
As for the device disconnected issue i'm not sure how to solve that one you could try running flashtool in windows 7 compatible mode.

okanb3 said:
I was trying this but Lg Flash Tool Stuck at %60. I was not update LG Drivers maybe because of this. I dont know what to do now. What must i have to do?
http://i65.tinypic.com/2u4op37.jpg
Click to expand...
Click to collapse
When can't go , I choose phonediag to CSEmergency flashing can finished.
I have use CSEmergency 3 times sucsessfully with CSE Flash and newest driver.

Solved my problem. The problem was using LGUP firmware to go back to stock. LGUP Doesnt work if you had root+twrp. Flashed kdz using the Lg Flash Tool 2014 ( I had really more problems when doing this but i made it.) Phone back to normal.

Cannot flash G4 H815 TWN with LGUP. Continual "Invalid TOT file" errors.

Hi All,
I received the official LG OTA MM update for my H815 (TWN) a week ago and I've just noticed that the bluetooth function now doesn't work at all. It won't even turn on and there is no MAC address associated with bluetooth in settings (It just says "unavailable"). On 5.1.1 bluetooth worked fine.
I've been trying all day to downgrade back to LP 5.1.1 using LGUP but it gives the "TOT file is invalid[1]" error with every KDZ file I have tried.
I have tried these KDZs:
Europe H81520C_00_1218.kdz
Europe OPEN H81510D.kdz
TWN H81520b_00_1218.kdz
The phone is running MM 6.0 and V20c
LGUP detects it as "H815" on COM4 when connected.
Does anyone have any ideas as to what I am doing wrong? I really need the bluetooth to work and this is soooooo frustrating.
Thanks in advance.

Todes Angst said:
Hi All,
I received the official LG OTA MM update for my H815 (TWN) a week ago and I've just noticed that the bluetooth function now doesn't work at all. It won't even turn on and there is no MAC address associated with bluetooth in settings (It just says "unavailable"). On 5.1.1 bluetooth worked fine.
I've been trying all day to downgrade back to LP 5.1.1 using LGUP but it gives the "TOT file is invalid[1]" error with every KDZ file I have tried.
I have tried these KDZs:
Europe H81520C_00_1218.kdz
Europe OPEN H81510D.kdz
TWN H81520b_00_1218.kdz
The phone is running MM 6.0 and V20c
LGUP detects it as "H815" on COM4 when connected.
Does anyone have any ideas as to what I am doing wrong? I really need the bluetooth to work and this is soooooo frustrating.
Thanks in advance.
Click to expand...
Click to collapse
Flash recovery firmware using LG Bridge. That'll solve the problem.
You seem to have flashed wrong (partially incompatible) KDZ file on your device. Talking about H815 itself, there are multiple versions based upon provider and country. So flash recovery firmware, and dont do it when your device is on.
Here is how you should do it:
1. Download LG bridge on your computer.
2. Switch off your Device, pull out your battery.
3. Attach your USB Cable from desktop to mobile
4. Hold volume up button, and put your battery while holding it. It should switch on itself if the USB is attached and you are holding volume up before putting in battery.
5. Once its on Bootloader, flash firmware recovery from LG Bridge.

Dark$tar said:
Flash recovery firmware using LG Bridge. That'll solve the problem.
You seem to have flashed wrong (partially incompatible) KDZ file on your device. Talking about H815 itself, there are multiple versions based upon provider and country. So flash recovery firmware, and dont do it when your device is on.
Here is how you should do it:
1. Download LG bridge on your computer.
2. Switch off your Device, pull out your battery.
3. Attach your USB Cable from desktop to mobile
4. Hold volume up button, and put your battery while holding it. It should switch on itself if the USB is attached and you are holding volume up before putting in battery.
5. Once its on Bootloader, flash firmware recovery from LG Bridge.
Click to expand...
Click to collapse
Thanks Dark$tar. I did what you suggested and the LGbridge reinstalled MM6.0 onto the phone. I then did a hard reset and nothing is different. The bluetooth functionality still doesn't work at all and any attempt to flash the phone with LGUP still givers the "TOT file is invalid[1]" error with every KDZ I have. Thanks for your help though, at least I know I can recover the phone with LGBridge should I need to again.

Todes Angst said:
Thanks Dark$tar. I did what you suggested and the LGbridge reinstalled MM6.0 onto the phone. I then did a hard reset and nothing is different. The bluetooth functionality still doesn't work at all and any attempt to flash the phone with LGUP still givers the "TOT file is invalid[1]" error with every KDZ I have. Thanks for your help though, at least I know I can recover the phone with LGBridge should I need to again.
Click to expand...
Click to collapse
Glad to hear that I could help! Also, if your bluetooth is still not working, it seems to be a hardware issue. Now that you have flashed the stock firmware via LG Bridge, you can claim warranty and get it fixed!
---------- Post added at 06:11 AM ---------- Previous post was at 06:03 AM ----------
Todes Angst said:
Thanks Dark$tar. I did what you suggested and the LGbridge reinstalled MM6.0 onto the phone. I then did a hard reset and nothing is different. The bluetooth functionality still doesn't work at all and any attempt to flash the phone with LGUP still givers the "TOT file is invalid[1]" error with every KDZ I have. Thanks for your help though, at least I know I can recover the phone with LGBridge should I need to again.
Click to expand...
Click to collapse
Also, though I think you wouldn't have made this mistake but since you mentioned it installed MM, so I want to ask:
Did you click on firmware upgrade or the firmware recovery? Note that the firmware update will simply use the base OS files and will replace the new ones and recovery firmware will replace the entire OS (refurbished). The Recovery Option is on Bottom right, in form of text which you need to click whereas the update option is the button on the same screen in the center that you don't have to click. Both of them have completely different functionality.
If you have done it right, well then I am 90% certain its the hardware issue. But I believe that the firmware backup is likely to install the November's released version of LP not MM (unless LG has recently changed that) which is why I am wondering.

Yeah, I clicked the blue recovery text in the Bottom right corner. It definitely installed MM 6.0 onto the phone.
Also, I have found out the cause of the bluetooth issue and unfortunately I have to wait for the next Android update. There was a large discussion on code.google.com about the exact problem I have and the current workaround requires the phone to be rooted. I don't think it's possible to root the H815 TWN yet.

Todes Angst said:
Hi All,
I received the official LG OTA MM update for my H815 (TWN) a week ago and I've just noticed that the bluetooth function now doesn't work at all. It won't even turn on and there is no MAC address associated with bluetooth in settings (It just says "unavailable"). On 5.1.1 bluetooth worked fine.
I've been trying all day to downgrade back to LP 5.1.1 using LGUP but it gives the "TOT file is invalid[1]" error with every KDZ file I have tried.
I have tried these KDZs:
Europe H81520C_00_1218.kdz
Europe OPEN H81510D.kdz
TWN H81520b_00_1218.kdz
The phone is running MM 6.0 and V20c
LGUP detects it as "H815" on COM4 when connected.
Does anyone have any ideas as to what I am doing wrong? I really need the bluetooth to work and this is soooooo frustrating.
Thanks in advance.
Click to expand...
Click to collapse
Hi, I have the same problem, did you find a solution to "tot file is invalid" error message?

No, I didn't. Every one I tried gave me that error. I just gave up in the end.

Random Reboots and Bootloops

I flashed 30c firmware with flashtool 2014 over rooted 21a (i think) on my D855 from Greece. I selected the normal flash to keep my files and apps, phone mode: DIAG and didn't clear the update registry. Phone worked normal for a week and then went into a boot loop. The phone randomly restarts and goes into loops for a while and then snaps out of it.
I have tried the following and none have fixed the issue:
-Replaced the battery.
-Upgraded to 30f over lg pc suite hoping it would fix it but it didn't.
-Flashed 30c and 30f over LG Flash tool with CS_EMERGENCY mode and cleared the updated registry.
-LG Flash tool wont flash any older lollipop kdz I tried. The phone screen flashes once but stays at 0% and then I receive a phone disconnected message.
-Put the device into safe mode and used the option on lg pc suite to fix upgrade errors. Didn't fix anything lol
-Tried factory reset. Nothing happened after I selected the yes on the confirmation.
-Tried to use LGUP hoping to install a lollipop kdz but it gives me an error message that I have to select a known model. Restarting the app and the phone didn't work either.
-Tried a guide on how to unroot and return to stock with the kitkat .tot file .
I really have no idea what else to try. Any help would be greatly appreciated.

louster35 said:
I flashed 30c firmware with flashtool 2014 over rooted 21a (i think) on my D855 from Greece. I selected the normal flash to keep my files and apps, phone mode: DIAG and didn't clear the update registry. Phone worked normal for a week and then went into a boot loop. The phone randomly restarts and goes into loops for a while and then snaps out of it.
I have tried the following and none have fixed the issue:
-Replaced the battery.
-Upgraded to 30f over lg pc suite hoping it would fix it but it didn't.
-Flashed 30c and 30f over LG Flash tool with CS_EMERGENCY mode and cleared the updated registry.
-LG Flash tool wont flash any older lollipop kdz I tried. The phone screen flashes once but stays at 0% and then I receive a phone disconnected message.
-Put the device into safe mode and used the option on lg pc suite to fix upgrade errors. Didn't fix anything lol
-Tried factory reset. Nothing happened after I selected the yes on the confirmation.
-Tried to use LGUP hoping to install a lollipop kdz but it gives me an error message that I have to select a known model. Restarting the app and the phone didn't work either.
-Tried a guide on how to unroot and return to stock with the kitkat .tot file .
I really have no idea what else to try. Any help would be greatly appreciated.
Click to expand...
Click to collapse
Replace the battery

I have the same problem and i got into the problem for the same reason.... the random rebooting that everyone says is down to the battery is something more sinister... i have tried 4 different batterys that work perfectly and it still happened i flashed a kdz and now i have a bootloop and no OS none of the other kdz files work neither do the tot files and lgup doesnt recognise my device... stuck...

Anik49 said:
Replace the battery
Click to expand...
Click to collapse
That's the first thing I tried on my list of failed attempts to fix the problem as you can see... Brand new battery. No change.
DjCaprio tried 4 different batteries as you can see.
This is just terrible!

louster35 said:
That's the first thing I tried on my list of failed attempts to fix the problem as you can see... Brand new battery. No change.
DjCaprio tried 4 different batteries as you can see.
This is just terrible!
Click to expand...
Click to collapse
http://forum.xda-developers.com/lg-...to-lp-using-lg-t3283912/post64597779......try to use this for flashing lolipop kdz...see what happen.

Anik49 said:
http://forum.xda-developers.com/lg-...to-lp-using-lg-t3283912/post64597779......try to use this for flashing lolipop kdz...see what happen.
Click to expand...
Click to collapse
I tried removing the battery while connected to the pc via usb already. The other trick that involves editing a file requires root.
My phone started flashing the blue screen of death today so I finally took it to LG so they can check it out. Either way thanks for trying to help.