REQUEST v50s LM-V510N crossflashed and can't get into download mode

[iMarzateD]

Hi everyone, I bought this phone working from second hand but the seller told me he tried to unlock the bootloader without success and the phone still loose the fingerprint sensor, so I decided to unlock the bootloader successfully following THIS thread and made a downgrade to Android 9 according to THIS other tutorial hopping to get it work again but I wasn't able to do it, so I decided to just use LGUP to install the same Android 12 that I had but the problem started at this point because once the KDZ was installed successfully, the deviced got a bootloop but I still was able to get into EDL, Fastboot and Download Mode, so I tried the steps from THIS other thread to unbrick it but it got even worse at this point, I flashed all the abl, xbl, etc. partitions and the "rawprograme files" via QFIL and then the phone won't even gave any life signals. I contacted someone that some months ago had the same problem and he told me that I could get into EDL by short pining the test point on the motherboard, which actually worked, so I extracted the KDZ Android 9 rom that I flashed in the first place to get the original abl, xbl, etc. partitions that I crossflashed from a v50 (Which I downloaded from the corresponding thread for unbrick), in other words I flashed the same partitions with the correct v50s files instead other model ones. So now this is where I'm right now, the phone don't turns on at all but when I connect it to the PC it gets recognized as LGE Android Platform USB Serial Port (COM11) and the buttons combinations don't work at all, so still can't get into Download mode by any method or even turn off the device, but I still can disconnect the battery and short pin the Qualcomm 9008 mode to use QFIL.

Would someone please be so kind of telling me how could I recover the Download Mode to use the COM4 and COM5 ports to flash the phone via LGUP?. According to THIS other thread, I could get the correct XML "rawprograme files" for my device (which I crossflashed with the v50) from a KDZ using some tools and Python, but I have to be honest: I DON'T KNOW HOW, even with the step by step tutorial.

At this point I think this would be the right step, to flash all the original files for my model and get the Download Mode back to be able to flash the KDZ rom via LGUP and update via OTA to Android 12 again to avoid the bootloop problem.

 

[darrelama]

try to reflash(QFIL method) modified abl should get the download mode back

 

[iMarzateD]

try to reflash(QFIL method) modified abl should get the download mode back

Thanks for replying, but I have some questions:
1. The abl file you mean is the engineering one? And...
2. Would you be so kind of telling me how to flash via QFIL? I've seen that it's possible but as far as I know, I need a specific type of rom files to do it, and I don't know how to convert a KDZ or where to download a QFIL ROM.

Thanks!

 

[darrelama]

Thanks for replying, but I have some questions:
1. The abl file you mean is the engineering one? And...
2. Would you be so kind of telling me how to flash via QFIL? I've seen that it's possible but as far as I know, I need a specific type of rom files to do it, and I don't know how to convert a KDZ or where to download a QFIL ROM.

Thanks!

yes, engineering one mentioned here （THIS）
QFIL>Tools > Partition Manager
read abl_a and abl_b to backup then load abl engineering file to both

basically the same steps up to the following:
"Go back to Partition Manager and right click on abl_a again then select Manage Partition Data, then Select Load and choose the abl engineering file.
Do the same for abl_b."

then try download mode

 

[iMarzateD]

yes, engineering one mentioned here （THIS）
QFIL>Tools > Partition Manager
read abl_a and abl_b to backup then load abl engineering file to both

basically the same steps up to the following:
"Go back to Partition Manager and right click on abl_a again then select Manage Partition Data, then Select Load and choose the abl engineering file.
Do the same for abl_b."

then try download mode

Hello again, already tried flashing the engineering abl but I still can't get into download mode. The phone keeps off the whole time and by plugging in the USB cable, no matter what button combination, the PC always recognizes it as the same LGE Android Patform USB Serial Port (COM11), the only other state of the device is the Qualcomm 9008 by pinning the motherboard. This specific COM11 state never was able to flash anything by PC, I don't know what actual mode is, but when I was able to set the devide in Download Mode the PC always showed 2 devices in the Device Manager, the COM5 and the COM4, that way I knew I was able to use the LGUP to flash. I'm thinking that I'm not setting the phone on the correct state to flash by any method, but since the buttons seems not to work, I don't know how could I do it.

 

[ardian1899]

While on this mode "LGE Android Patform USB Serial Port (COM11)", try to hold both power and vol- for some seconds until the "LGE Android Patform USB Serial Port (COM11)" disappear from your PC device manager and immediately release both and now hold vol+ button to get into download mode.

You can do it while on the 9008 mode too though.

Maybe that can help.

I have LUNs backup for v50s but I can't upload it due to my internet plan quota limit.

 

[iMarzateD]

While on this mode "LGE Android Patform USB Serial Port (COM11)", try to hold both power and vol- for some seconds until the "LGE Android Patform USB Serial Port (COM11)" disappear from your PC device manager and immediately release both and now hold vol+ button to get into download mode.

You can do it while on the 9008 mode too though.

Maybe that can help.

I have LUNs backup for v50s but I can't upload it due to my internet plan quota limit.

Thanks, I'll try that for sure to see if I can get into the Download Mode or something. I would appreciate so much if you could share your backup, since I think I could restore the whole firmware with it, but I don't have any experience on the "LUNs" tho. I'm any case, I don't have too much time every week to give it a try, so I hope tomorrow I could test the combo you say.