Can't get into download mode! Only fastboot.

Can't get into download mode! Only fastboot. - T-Mobile LG G3

My dad has had some software bugs with his G3 and asked if I could take it back to stock. Mentioning the KDZ method specifically. I tried to pit his phone into download mode and it flashes the download mode screen for a second then says
"[600]fastboot mode started
[630] --reset--
[630] --portchange--
[810] faatboot: processing commands. "
What can I do to fix it and get into DL mode? Thanks!

cammykool said:
My dad has had some software bugs with his G3 and asked if I could take it back to stock. Mentioning the KDZ method specifically. I tried to pit his phone into download mode and it flashes the download mode screen for a second then says
"[600]fastboot mode started
[630] --reset--
[630] --portchange--
[810] faatboot: processing commands. "
What can I do to fix it and get into DL mode? Thanks!
Click to expand...
Click to collapse
set up Adb and fastboot on your computer, then push the laf.img so you can get your recover back. Make sure the laf.img is the one for your device!

done! thank you kind sir!

Related

[Q] LG G3 Stuck on fastboot! [FIXED!!!!!]

I was trying to install TWRP on my phone (LS990, ZV8) using flashify app. This didn't work and after I did so, every time I would try to "reboot into recovery" the phone would get stuck and I would need to pull the battery out. I then read somewhere that the fix was to delete the aboot.img and install the kitkat aboot.img . I tried to do that, and afterwards my phone won't boot at all. It gets stuck and screen turns black and the LED flashes. It sometimes gives me an error message about the bootloader I think. If I try to boot into Download mode, it (sometimes) takes me straight into fastboot instead. When I try to run fastboot and type "devices" I either get back nothing or now I get back a "?". Maybe I don't have the proper driver. Please Please help!!!
Upsdate: Ok so I played with the drivers and although I still can't get a response to "fastboot devices" I tried to flash a recovery and I can get response on the phone to some degree. It says "fastboot: getwarartition-type:recovery" but the cmd prompt on the computer says "cannot load recovery.img".
Maybe I just need to try and flash a bootloader or a download mode. Anyone know where I can get an laf for download mode. Or Have any directions?
Please help me!!!
UPDATE: FIXED IT!!!! What I did was use fastboot to load up an laf.img that I was able to download from someone on here (took a lot of searching to find an laf.img). Even though I was unable to flash the laf (tried a bunch of times and it always gave me that "failure to write" error right at the end), I was able to use fastboot to boot up the laf.img that was on my computer and that got the phone into download mode. Bear in mind that I still wouldn't get the serial number back from "fastboot devices" so if you're having this problem and it doesn't give you the serial number back it's ok. Just try to run some fastboot commands and see if you get a response on the phone, that way you'll know if fastboot is working. Anyway, I was then able to restore it via LGFlashtool. So yup, its fixable!

MWGiants said:
I was trying to install TWRP on my phone (LS990, ZV8) using flashify app. This didn't work and after I did so, every time I would try to "reboot into recovery" the phone would get stuck and I would need to pull the battery out. I then read somewhere that the fix was to delete the aboot.img and install the kitkat aboot.img . I tried to do that, and afterwards my phone won't boot at all. It gets stuck and screen turns black and the LED flashes. It sometimes gives me an error message about the bootloader I think. If I try to boot into Download mode, it (sometimes) takes me straight into fastboot instead. When I try to run fastboot and type "devices" I either get back nothing or now I get back a "?". Maybe I don't have the proper driver. Please Please help!!!
Upsdate: Ok so I played with the drivers and although I still can't get a response to "fastboot devices" I tried to flash a recovery and I can get response on the phone to some degree. It says "fastboot: getwarartition-type:recovery" but the cmd prompt on the computer says "cannot load recovery.img".
Maybe I just need to try and flash a bootloader or a download mode. Anyone know where I can get an laf for download mode. Or Have any directions?
Please help me!!!
Click to expand...
Click to collapse
Unfortunately its hard bricked and the repair center will know that you tampered with it. The nature of the LG bootloader makes it so that you cant write or boot any images using fastboot.
What was wrong with your method is, when you downgrade to KitKat android bootloader you have to also downgrade the bootloader, laf and recovery partition or other wise it bricks. You should have downgraded your phone using LG Flash Tool to KitKat and then root and install whatever you wanted
In your case the version mismatch between your aboot, bootloader and laf partition is the reason why it doesnt work

itsbighead said:
Unfortunately its hard bricked and the repair center will know that you tampered with it. The nature of the LG bootloader makes it so that you cant write or boot any images using fastboot.
What was wrong with your method is, when you downgrade to KitKat android bootloader you have to also downgrade the bootloader, laf and recovery partition or other wise it bricks. You should have downgraded your phone using LG Flash Tool to KitKat and then root and install whatever you wanted
In your case the version mismatch between your aboot, bootloader and laf partition is the reason why it doesnt work
Click to expand...
Click to collapse
OK sir, I fixed it so clearly it was not hard bricked (don't say that if you aren't sure, it would have cost me plenty of money to replace that had I not known better). What I did was use fastboot to load up an laf.img that I was able to download from someone on here. Even though I was unable to flash the laf, I was able to use fastboot to boot up the laf.img that was on my computer and that got the phone into download mode. I was then able to restore it via LGFlashtool. So yup, its fixable!
573v3 said:
If, as you say, you can enter Download Mode, you could try this Method by @hyelton :- http://forum.xda-developers.com/showthread.php?t=2785089. Any problems ask in that Thread, they will try and Help. GOOD LUCK.......:good:
Click to expand...
Click to collapse
Yeah, once I got it into download mode (that was the whole problem, I was stuck in fastboot) I was able to fix it.

MWGiants said:
OK sir, I fixed it so clearly it was not hard bricked (don't say that if you aren't sure, it would have cost me plenty of money to replace that had I not known better). What I did was use fastboot to load up an laf.img that I was able to download from someone on here. Even though I was unable to flash the laf, I was able to use fastboot to boot up the laf.img that was on my computer and that got the phone into download mode. I was then able to restore it via LGFlashtool. So yup, its fixable!
Yeah, once I got it into download mode (that was the whole problem, I was stuck in fastboot) I was able to fix it.
Click to expand...
Click to collapse
congrats. it is good to know it is fixable

That's awesome to hear. It seems that booting the laf partition does not actually work under fastboot mode for D855 variants which is why I thought it wouldn't work for you
Sent from my iPad using Tapatalk

That's great. And what fastboot commands did you use to execute the laf from your computer ?
Verstuurd vanaf mijn HTC One_M8 met Tapatalk

Hakem said:
That's great. And what fastboot commands did you use to execute the laf from your computer ?
Verstuurd vanaf mijn HTC One_M8 met Tapatalk
Click to expand...
Click to collapse
Fastboot boot laf.img
But beware this doesnt work for D855. His LS980 has a unlocked bootloader

Ok thanks
Verstuurd vanaf mijn HTC One_M8 met Tapatalk

MWGiants said:
I was trying to install TWRP on my phone (LS990, ZV8) using flashify app. This didn't work and after I did so, every time I would try to "reboot into recovery" the phone would get stuck and I would need to pull the battery out. I then read somewhere that the fix was to delete the aboot.img and install the kitkat aboot.img . I tried to do that, and afterwards my phone won't boot at all. It gets stuck and screen turns black and the LED flashes. It sometimes gives me an error message about the bootloader I think. If I try to boot into Download mode, it (sometimes) takes me straight into fastboot instead. When I try to run fastboot and type "devices" I either get back nothing or now I get back a "?". Maybe I don't have the proper driver. Please Please help!!!
Upsdate: Ok so I played with the drivers and although I still can't get a response to "fastboot devices" I tried to flash a recovery and I can get response on the phone to some degree. It says "fastboot: getwarartition-type:recovery" but the cmd prompt on the computer says "cannot load recovery.img".
Maybe I just need to try and flash a bootloader or a download mode. Anyone know where I can get an laf for download mode. Or Have any directions?
Please help me!!!
UPDATE: FIXED IT!!!! What I did was use fastboot to load up an laf.img that I was able to download from someone on here (took a lot of searching to find an laf.img). Even though I was unable to flash the laf (tried a bunch of times and it always gave me that "failure to write" error right at the end), I was able to use fastboot to boot up the laf.img that was on my computer and that got the phone into download mode. Bear in mind that I still wouldn't get the serial number back from "fastboot devices" so if you're having this problem and it doesn't give you the serial number back it's ok. Just try to run some fastboot commands and see if you get a response on the phone, that way you'll know if fastboot is working. Anyway, I was then able to restore it via LGFlashtool. So yup, its fixable!
Click to expand...
Click to collapse
Hey bro i m having same issue ! Can you please explain laf.img , i tried twrp.img !
What does 'laf' means

bikrame said:
Hey bro i m having same issue ! Can you please explain laf.img , i tried twrp.img !
What does 'laf' means
Click to expand...
Click to collapse
Hi, sorry for the late reply. I hope you've already fixed it, but if you're still having this problem then let me explain. "laf.img" is the "download mode" partition. The reason you can't use twrp.img (which is a recovery partition image) is because you're "too far gone" so to speak and not even at the point to try and get into recovery. You need to restore download mode first. If you have fastboot properly working (not going to explain that, look it up, there is plenty of info about that on here and other sites), then you can do what I did. (Although from what other people are saying if you have a D855 it will have a locked bootloader and this won't work, I cant tell you about that because I don't have one and haven't played around with one). Anyway, if you have fastboot working properly (read my first post about how it can be working as long as the phone is responsive, even if you don't get back the "devices comman", you may need to play around with the drivers to get this to work) then you need to obtain an laf.img from somwhere. I found a complete set of .img's for my model somewhere (don't remember if it was on this site or somewhere else). It took a lot of searching, but I'm sure you can find one. Once you have that and the working fastboot then run the command "fastboot boot [location of your laf.img]laf.img"
GOOD LUCK!!!

itsbighead said:
That's awesome to hear. It seems that booting the laf partition does not actually work under fastboot mode for D855 variants which is why I thought it wouldn't work for you
Sent from my iPad using Tapatalk
Click to expand...
Click to collapse
That's interesting...do you have any idea why that would be? Is it a locked bootloader like someone else mentioned? (I don't know much about the D855 model, never got to play with one). Maybe there is a workaround we can come up with...

itsbighead said:
Unfortunately its hard bricked and the repair center will know that you tampered with it. The nature of the LG bootloader makes it so that you cant write or boot any images using fastboot.
What was wrong with your method is, when you downgrade to KitKat android bootloader you have to also downgrade the bootloader, laf and recovery partition or other wise it bricks. You should have downgraded your phone using LG Flash Tool to KitKat and then root and install whatever you wanted
In your case the version mismatch between your aboot, bootloader and laf partition is the reason why it doesnt work
Click to expand...
Click to collapse
I realized the problem with the mismatched aboot after the fact... ironically it all worked out because after all of this I am now back to the original kitkat and can just root and flash as you said lol.

Complete Fix Guide
http://forum.xda-developers.com/spr...y-download-t3053985/post60106965#post60106965

Can you please post where you got your laf file? I have the same problem :crying:

MWGiants said:
I was trying to install TWRP on my phone (LS990, ZV8) using flashify app. This didn't work and after I did so, every time I would try to "reboot into recovery" the phone would get stuck and I would need to pull the battery out. I then read somewhere that the fix was to delete the aboot.img and install the kitkat aboot.img . I tried to do that, and afterwards my phone won't boot at all. It gets stuck and screen turns black and the LED flashes. It sometimes gives me an error message about the bootloader I think. If I try to boot into Download mode, it (sometimes) takes me straight into fastboot instead. When I try to run fastboot and type "devices" I either get back nothing or now I get back a "?". Maybe I don't have the proper driver. Please Please help!!!
Upsdate: Ok so I played with the drivers and although I still can't get a response to "fastboot devices" I tried to flash a recovery and I can get response on the phone to some degree. It says "fastboot: getwarartition-type:recovery" but the cmd prompt on the computer says "cannot load recovery.img".
Maybe I just need to try and flash a bootloader or a download mode. Anyone know where I can get an laf for download mode. Or Have any directions?
Please help me!!!
UPDATE: FIXED IT!!!! What I did was use fastboot to load up an laf.img that I was able to download from someone on here (took a lot of searching to find an laf.img). Even though I was unable to flash the laf (tried a bunch of times and it always gave me that "failure to write" error right at the end), I was able to use fastboot to boot up the laf.img that was on my computer and that got the phone into download mode. Bear in mind that I still wouldn't get the serial number back from "fastboot devices" so if you're having this problem and it doesn't give you the serial number back it's ok. Just try to run some fastboot commands and see if you get a response on the phone, that way you'll know if fastboot is working. Anyway, I was then able to restore it via LGFlashtool. So yup, its fixable!
Click to expand...
Click to collapse
can you please help. adb shows my device and fastboot wont. when i type in fastboot devices it doesnt show anything. tried to run commands but it always gets stuck on waiting for device..

MWGiants said:
(Although from what other people are saying if you have a D855 it will have a locked bootloader and this won't work,
Click to expand...
Click to collapse
What to do with D855 than, my friend have D855 and it's stcked in fastboot mode, doesn't allow to flash anything?

lg g3 f410 stuck at fastboot
i tried the solution it didnot work. phone accepts the cmds but remain stuck at fastboot any other method?

[Q] LG G2 LS980 can't get into download mode, not even fastboot!!!

Hi guys, i had a LG G2 LS980
I flashed the wrong D802 with it and now it bricked. it just stay at LG boot-logo forever!!!
At first, i was trying to boot into download mode so i can flash back the correct one. but all i can get is ONLY half way into download mode,
i attached a picture of it so you guys can understand what i'm trying to say here.
i done many seach, and it show that i should get into fastboot mode in order to fix this.
Can someone please help me here, thanks.
What should i do now? T_T

Check this link, as I found this out. Hopefully this helps out.
http://forum.xda-developers.com/showthread.php?t=2582142

I had the same issue and this is what @bender_007 had me do. (All credit is his.)
READ IT ALL FIRST!!!
If you can't get into TWRP you can't do this... I don't have CWM so I don't know if it works with that...
1) Download this: https://www.androidfilehost.com/?fid=95916177934554346
2) Get into TWRP and connect your USB to your computer. See if Windows recognizes it as an ADB device (get it do so if it doesn't) and use
Code:
adb push ls980_unbrick.zip /sdcard/
to get it onto your phone. (If you rename the file use that name.)
3) Flash it in TWRP. Unplug your phone.
THE FOLLOWING IS IMPORTANT!!!4) After flashing the file DO NOT REBOOT, go back in TWRP to turn the phone OFF.
5) Hold Vol Up and insert USB into your computer AND KEEP HOLDING Vol Up.
6) You should see Download mode appear. Flash with LGFlashTool.
7) Profit

MrTriTanium said:
I had the same issue and this is what @bender_007 had me do. (All credit is his.)
READ IT ALL FIRST!!!
If you can't get into TWRP you can't do this... I don't have CWM so I don't know if it works with that...
1) Download this: https://www.androidfilehost.com/?fid=95916177934554346
2) Get into TWRP and connect your USB to your computer. See if Windows recognizes it as an ADB device (get it do so if it doesn't) and use
Code:
adb push ls980_unbrick.zip /sdcard/
to get it onto your phone. (If you rename the file use that name.)
3) Flash it in TWRP. Unplug your phone.
THE FOLLOWING IS IMPORTANT!!!4) After flashing the file DO NOT REBOOT, go back in TWRP to turn the phone OFF.
5) Hold Vol Up and insert USB into your computer AND KEEP HOLDING Vol Up.
6) You should see Download mode appear. Flash with LGFlashTool.
7) Profit
Click to expand...
Click to collapse
That was very helpfull thank you a lot!!!! :laugh: :laugh: :laugh:

[email protected] said:
Hi guys, i had a LG G2 LS980
I flashed the wrong D802 with it and now it bricked. it just stay at LG boot-logo forever!!!
At first, i was trying to boot into download mode so i can flash back the correct one. but all i can get is ONLY half way into download mode,
i attached a picture of it so you guys can understand what i'm trying to say here.
i done many seach, and it show that i should get into fastboot mode in order to fix this.
Can someone please help me here, thanks.
What should i do now? T_T
Click to expand...
Click to collapse
I'm having same issue... Device just showing mini download mode as like your attachment.. How to solve this issue.. And how to force adb mode?

fastboot and download mode problem

Hi
i have a problem with my G4 H815, i can't access fastboot mode even throw adb commands or throw quickboot apk the phone restarts immediately
the same thing with download mode it restart few 3 or 4 seconds after showing download mode screen
anyone can help please
thanks in advance

Same Here... Any Idea ?
I actuallay am in the same situation with my brand new LG G4 H815 that I have just unlocked.
Everytime I try to get access to the fastboot mode, I get confirmation that my bootloader is unlocked (message on screen),then directly to a normal boot, so I can't flash anything.
If anyone has an idea to solve that it would be much appreciated.
smich_ayane said:
Hi
i have a problem with my G4 H815, i can't access fastboot mode even throw adb commands or throw quickboot apk the phone restarts immediately
the same thing with download mode it restart few 3 or 4 seconds after showing download mode screen
anyone can help please
thanks in advance
Click to expand...
Click to collapse

Same thing here. I can only enter fastboot from an adb shell, but today's CM14 update doesn't boot so no ADB shell, now I'm stuck with a phone that can't fastboot.
Moreover, CM14 recovery just displays "erasing' then reboots.

Secure Booting Error! Cause: boot certification verify

Good day mate. My brick phone is F460S variant. I got this error when I tried to go back to Lollipop using Lg flash tool 2014, it got stuck on 5% and remove usb cable and start again, after that I got this error Secure Booting Error! Cause: boot certification verify.
No download mode
No recovery
anyone can help me please?:crying:

anyone?

You have triggered the downgrade QFUSE. There is nothing you can do apart from trying to unbrick it like it was dead, but that's not guaranteed to work. You should have researched more before attempting this. My prototype doesn't have a QFUSE, so i am free to downgrade via TOT to kitkat or lollipop.

西村大一 said:
You have triggered the downgrade QFUSE. There is nothing you can do apart from trying to unbrick it like it was dead, but that's not guaranteed to work. You should have researched more before attempting this. My prototype doesn't have a QFUSE, so i am free to downgrade via TOT to kitkat or lollipop.
Click to expand...
Click to collapse
What does QFUSE mean?

anmino said:
What does QFUSE mean?
Click to expand...
Click to collapse
I second you on this. I just uninstalled MultiROM and got the secure booting error. Depending on the ROM you have, find a bumped kernel and flash it. Most of the kernels on XDA are pre-bumped unless the developer states so. Boot into recovery, tutorials on the internet, then flash the kernel and voila.

if you can use twrp or you're able to flash, use mr_bump.zip: https://mega.nz/#!DNwhRBrK!Ki6zIzXca0KjPShi6L2oaCYIr0CkmH8sEymEt-0Q3ys
oh sorry, I didn't see "no recovery".

HardStyl3r said:
if you can use twrp or you're able to flash, use mr_bump.zip: https://mega.nz/#!DNwhRBrK!Ki6zIzXca0KjPShi6L2oaCYIr0CkmH8sEymEt-0Q3ys
oh sorry, I didn't see "no recovery".
Click to expand...
Click to collapse
Yes, no DOWNLOAD mode and RECOVERY mode.. Anyone have an idea how to fix this?

anyone?

Hello, i got the same probleme and i've trying a lot of things but not resolved..
My phone is a LG G3 Beat F470s..
Please help us..

Dowblnload adb and fastboot drivers
Download laf.img for your device
Download LG Drivers
Get you G3 to fastboot mode. Hold volume up and connect it to PC
Open fastboot and adb folder in PC, ctrl+shift+right click and open cmd. Type fastboot devices...if ur device is listen then proceed, if not u did not do something cotrectly...if yes just flash laf img to your G3 and voila

I remember me that I was in the same situation:
No TWRP, no download mode, so i have use in pat this thread:
https://forum.xda-developers.com/showthread.php?t=1752270
And an other that i haven't found again (xda thread), in some lines:
=> download the last img file from: https://eu.dl.twrp.me/d855/
=> no download mode available so no possibility to flash manually twrp file from an LG Flash Tool
==> so setup an adb connexion to the phone, cp command to copy the img file on the sdcard or where you want
=> command: "flash recovery twrp-2.8.x.x-xxx.img" (https://www.xda-developers.com/how-to-install-twrp/
=> if it's as worked, you could reboot manually in twrp, make again the partitions if needed and flash any ROM.

LG G7 - Fastboot bootloop [SOLVED]

After trying to flash Pie my G7 stuck in fastboot mode. Download mode is unavailable so I not can reset the stock ROM.
After it reboots it boots into only to fastboot mode and is stuck in a loop now.
An even bigger problem is that now the bootloader is locked and the unlock.bin file can not unlock the bootloader.
ADB mode is not working!
DOWNLOAD mode is not working!
SYSTEM mod does not work!
There is only FASTBOOT mode that is in the loop
Does anyone have any suggestions?

Prosjak said:
After trying to flash Pie my G7 stuck in fastboot mode. Download mode is unavailable so I not can reset the stock ROM.
After it reboots it boots into only to fastboot mode and is stuck in a loop now.
An even bigger problem is that now the bootloader is locked and the unlock.bin file can not unlock the bootloader.
ADB mode is not working!
DOWNLOAD mode is not working!
SYSTEM mod does not work!
There is only FASTBOOT mode that is in the loop
Does anyone have any suggestions?
Click to expand...
Click to collapse
Try to get into lgup to flash a kdz, if you cant do that you might be SOL

LGUP does not detect phone, download mode is not working

hi
Prosjak said:
LGUP does not detect phone, download mode is not working
Click to expand...
Click to collapse
Please contact me, I can help you recover the device

PjLyTam said:
Please contact me, I can help you recover the device
Click to expand...
Click to collapse
How to contact you and how you can help me.
If you want to help write this here to help this benefit to anyone who has this or similar problem
Thank you

Prosjak said:
After trying to flash Pie my G7 stuck in fastboot mode. Download mode is unavailable so I not can reset the stock ROM.
After it reboots it boots into only to fastboot mode and is stuck in a loop now.
An even bigger problem is that now the bootloader is locked and the unlock.bin file can not unlock the bootloader.
ADB mode is not working!
DOWNLOAD mode is not working!
SYSTEM mod does not work!
There is only FASTBOOT mode that is in the loop
Does anyone have any suggestions?
Click to expand...
Click to collapse
Fastboot --set-active=a

LameMonster82 said:
Fastboot --set-active=a
Click to expand...
Click to collapse
Thank you for your reply
The problem is that the bootloader is locked
C:\ADB>Fastboot --set-active=a
Setting current slot to 'a'...
FAILED (remote: Slot Change is not allowed in Lock State)
finished. total time: 0.003s

Problem solved
Octoplus/Octopus LG 2.9.3
Reset FRP Lock
1. Attach testpoint, and connect phone with Micro USB cable (don´t use USB hubs!).
2. Check PC Device Manager, a new device should appear "Qualcomm HS-USB QDLoader 9008" or "Unknown Device" if you hadn´t installed a driver.
3. Release testpoint and press "Reset FRP Lock" button.
Emergency mode
To enter emergency mode, disconnect cable, disconnect battery, press and hold "Vol+" button and connect USB cable.
My lucky day

What version of G7 use?
Sent from my LM-G710 using Tapatalk

PjLyTam said:
Please contact me, I can help you recover the device
Click to expand...
Click to collapse
i got this problem too.. please help with that

Prosjak said:
Octoplus/Octopus LG 2.9.3
Reset FRP Lock
1. Attach testpoint, and connect phone with Micro USB cable (don´t use USB hubs!).
2. Check PC Device Manager, a new device should appear "Qualcomm HS-USB QDLoader 9008" or "Unknown Device" if you hadn´t installed a driver.
3. Release testpoint and press "Reset FRP Lock" button.
Emergency mode
To enter emergency mode, disconnect cable, disconnect battery, press and hold "Vol+" button and connect USB cable.
My lucky day
Click to expand...
Click to collapse
how i can do this?

My G710EM has a problem with my lockback BL. I can't boot the system and it will prompt "Your device has failed a routine safety check and will not boot. This may be a temporary problem. If this message occurs repeatedly, visit this link on Another device and refer to the red case:g.co/ABH Your device will power off automatically after a while.” With LGup brush kdz brush does not go in, fastboot “fastboot flash unlock unlock.bin” prompt is invalid
* Target reported max download size of 536870912 bytes
Sending 'unlock' (1 KB)...
OKAY [ 0.004s]
Writing 'unlock'...
FAILED (remote: Flashing Unlock is not allowed
)
Finished. total time: 0.011s
I don't know what to do.

I had the very same problem as OP. I tried to install pie with LGUP (G710EM20b_00_OPEN_EU_OP_0508.kdz) but ended in fastboot loop.
After whole night of trying different things (being a noob means less sleep) I managed to run the phone in download mode. Starting from there I was able to install my previous rom. Both failed update and rescue operations were done on Win 10.
What I tried and didn't work:
- Fastboot --set-active=a
Code:
C:\ADB>Fastboot --set-active=a
Setting current slot to 'a'...
FAILED (remote: Slot Change is not allowed in Lock State)
finished. total time: 0.003s
- Unlocking with unlock.bin. Didn't save the msg but saw it somewhere in another thread. I needed to install/point drivers first because the device was not recognized in Win.
- Solutions for G6 for going into download mode. The download mode icon was displayed for a second and then going to fastboot again.
- LG Flash Tool 2014 - I just followed a guide for older phones but it didn't work. Didn't try again.
What did work:
1. I found this post on reddit (remove spaces or PM me, I'm not allowed to post links):
Code:
https:// www .reddit. com/r/LGG3/comments/2qe5sr/in_need_of_serious_help_stuck_in_fastbootno/cn5f2qr/?utm_source=share&utm_medium=web2x
Quoting the post
At first, you'll need a working fastboot environment, you'll find out how to set it up on your own. Then you'll need the laf.img, I can upload mine if you want or I could help you extracting one out of a kdz file. Put the laf.img in the same folder like your fastboot.exe, then hold shift and right click, then click on "open command panel here" or however it's called in English. Type "fastboot flash laf laf.img" (Edit: It would probably better to use "fastboot boot laf.img" instead because of the bootloader lock). If that works, you at least have a working download mode.
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Click to collapse
2. I used LG_Firmware_Extract_v1.2.6.1 and extracted dz file from aforementioned pie file. The I extracted two laf files for the kz file. In my case they were: laf.img_180534 and laf.img_81990.
3. I took one of these files (sry, don't remember which one, but they have the same size - didn't check if they're the same) renamed it to laf.img and put a folder where fastboot.exe is.
4. I did
Code:
fastboot boot laf.img
and voila: the phone was in download mode!
5. After that LGUP the previous rom and the phone is working again. Here I needed few tries. At first the were some problems, then I tried different combinations (1.14, 1.15, w/ and w/o uppercut). I think LGUP 1.15 (1.14 with patch) did the work. I was able to "refurbish" the phone.
Hope it's useful for others. If anyone could prepare a guide from this description or/and tell why it worked - please feel free to do so.
I think I will wait some time before trying pie again

Garlikus said:
I had the very same problem as OP. I tried to install pie with LGUP (G710EM20b_00_OPEN_EU_OP_0508.kdz) but ended in fastboot loop.
After whole night of trying different things (being a noob means less sleep) I managed to run the phone in download mode. Starting from there I was able to install my previous rom. Both failed update and rescue operations were done on Win 10.
What I tried and didn't work:
- Fastboot --set-active=a
Code:
C:\ADB>Fastboot --set-active=a
Setting current slot to 'a'...
FAILED (remote: Slot Change is not allowed in Lock State)
finished. total time: 0.003s
- Unlocking with unlock.bin. Didn't save the msg but saw it somewhere in another thread. I needed to install/point drivers first because the device was not recognized in Win.
- Solutions for G6 for going into download mode. The download mode icon was displayed for a second and then going to fastboot again.
- LG Flash Tool 2014 - I just followed a guide for older phones but it didn't work. Didn't try again.
What did work:
1. I found this post on reddit (remove spaces or PM me, I'm not allowed to post links):
Code:
https:// www .reddit. com/r/LGG3/comments/2qe5sr/in_need_of_serious_help_stuck_in_fastbootno/cn5f2qr/?utm_source=share&utm_medium=web2x
Quoting the post
2. I used LG_Firmware_Extract_v1.2.6.1 and extracted dz file from aforementioned pie file. The I extracted two laf files for the kz file. In my case they were: laf.img_180534 and laf.img_81990.
3. I took one of these files (sry, don't remember which one, but they have the same size - didn't check if they're the same) renamed it to laf.img and put a folder where fastboot.exe is.
4. I did
Code:
fastboot boot laf.img
and voila: the phone was in download mode!
5. After that LGUP the previous rom and the phone is working again. Here I needed few tries. At first the were some problems, then I tried different combinations (1.14, 1.15, w/ and w/o uppercut). I think LGUP 1.15 (1.14 with patch) did the work. I was able to "refurbish" the phone.
Hope it's useful for others. If anyone could prepare a guide from this description or/and tell why it worked - please feel free to do so.
I think I will wait some time before trying pie again
Click to expand...
Click to collapse
Thanks for you guide.. I follow it but unfortunatly after "fastboot boot laf.img" I get this message from my LG:
"Your device has failed a routine safety check.... it will reboot after a while.."

davinik84 said:
Thanks for you guide.. I follow it but unfortunatly after "fastboot boot laf.img" I get this message from my LG:
"Your device has failed a routine safety check.... it will reboot after a while.."
Click to expand...
Click to collapse
I recall I also had some error msg, it could've been the same. Now I don't remember what I exactly did next as most my actions were more or less random. Either I tried the same command but with other laf.img file (from the rom I used before), or I tried to restart the phone into download mode (vol- and power together and then vol+ after screen goes black) or tried the same file again.
Hope it helps.

davinik84 said:
Thanks for you guide.. I follow it but unfortunatly after "fastboot boot laf.img" I get this message from my LG:
"Your device has failed a routine safety check.... it will reboot after a while.."
Click to expand...
Click to collapse
I have the same problem as well. I follow the guide but I received the same error message

domenico.dalpiaz said:
I have the same problem as well. I follow the guide but I received the same error message
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Click to collapse
Check if the phone is recognized in LG Bridge. If so, then choose update error recovery from software update tab. Again, I don't remember if it worked immediately or did I need to reinstall drivers and/or choose a proper driver in device manager (generic ADB vs LG...) and/or restart the phone.

domenico.dalpiaz said:
I have the same problem as well. I follow the guide but I received the same error message
Click to expand...
Click to collapse
I have same error too ...

DenisVelev said:
I have same error too ...
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Click to collapse
Based on other threads, e.g. https://forum.xda-developers.com/v20/how-to/restore-v20-to-100-stock-bricked-devices-t3524903 and https://www.reddit.com/r/lgg6/comments/axd17d/lg_g6_eu_glh870_bricked_after_update_your_device/
try:
install the LG Bridge updater software on a computer, go to updates, click the "correct update errors" button. Then plug in your turned-off phone while holding down the volume up button. It should switch to download mode and reinstall all software from the PC. Yes, this will erase all data but it should unbrick your phone (unless the hardware's broken I guess)
Click to expand...
Click to collapse

Garlikus said:
Based on other threads, e.g. https://forum.xda-developers.com/v20/how-to/restore-v20-to-100-stock-bricked-devices-t3524903 and https://www.reddit.com/r/lgg6/comments/axd17d/lg_g6_eu_glh870_bricked_after_update_your_device/
try:
Click to expand...
Click to collapse
Cannot put in download mode. Only Fastboot. For a secound show download mode after that show fastboot mode.

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