Step by step guide for lg v20 h918 unlocking, downgrading, rooting and twrp

[hellboyborn]

Superb guide. Downgrade from 20h to 10p, unlocked rooted without any problem. Not even single error occurred anywhere and everything went smoothly. Thanks kish9046 and other guys whosoever involved for making it so easy and putting out steps so clean.

 

[Pheckphul]

Hi.

I followed the guide without problems up to the step2.sh , after which I got an encryption error upon reboot.

I followed the tip about wiping. I dont know if I did something wrong, but now there's no OS to reboot to, and there isn't the backup I made earlier. I'm currently manually flashing twrp and magisk. Twrp works fine, but I keep running into error code 1 when I try to flash Magisk. I looked it up on google, and found that it might be due to the twrp version, or lack of OS? I dont know. The twrp version says it is 3.2 30. Im trying to install Magisk v16.0.

What steps should I take next?

Edit: During the Magisk v16.0 installer on twrp, the step the error occurs at is as follows:

- Repacking boot image
! Unable to repack boot image!
- Unmounting partitions
Updater process ended with ERROR: 1
Error Installing zip file '/sdcard/Magisk-v16.0.zip'

No, I'm not a necrophiliac. I ran into the same problem when using this guide today, and I solved it by replacing the Magisk v16 with v20.4 and editing step2.sh to point to the correct file.

 

[Pheckphul]

Use LGUP?

Using this guide I ended up with an H918 with download mode replaced by TWRP. Does this mean I can't use LGUP to install a KDZ file now? If I can't, how can I restore download mode?

 

[CXZa]

Probably you figured out this by now but just in case...

Using this guide I ended up with an H918 with download mode replaced by TWRP. Does this mean I can't use LGUP to install a KDZ file now?

Yes.

If I can't, how can I restore download mode?

There is a laf_restore.zip in this other thread. Maybe it helps?

[ROOT] - lafsploit - H918 (any version up to and including 20h) - now n00b friendly

WARNING This should go without saying, but you MUST have your bootloader unlocked (check OEM UNLOCK in developer options AND fastboot oem unlock). If you don't, you WILL brick your phone. If you don't know how to FULLY unlock your...

forum.xda-developers.com

 

[TheMighyLoki]

I have a new phone but I would like to still use the V20 for music, but I would like to root and go to a better OS. I got upercut up and running but I am getting this "error: 0x2000 h918p_00_0717.kdz file does NOT support "Refurbish" process". What am I doing wrong? Never mind I got my head out of my rear end. Click the correct button and all is well.

 

[TheMighyLoki]

Okay so I am down to part 3 and can not get the usb pen drive to load FWUL all the way it just stalls. So I tried to to just use adb I get errors. Need help.
This is what I am getting in CMD
C:\Users\******\Desktop\V20 Root\platform-tools>fastboot flash recovery "C:\Users\******\Desktop\V20 Root\platform-tools\big_twrp.img"
Sending 'recovery' (23536 KB) OKAY [ 0.621s]
Writing 'recovery' FAILED (remote: 'unknown command')
fastboot: error: Command failled.

12-19-2020. Still can not get anything to work. Tried the instructions to use dirty cow and I get down to
"adb push recowvery-app_process64" and to stops at --------beinnging main.

I am using Windows 10Pro and the V20 is on H918p? Any help would be great.

 

[megamorphg]

Sadly I got the dreaded encrypted error at the end when booting. Everything else worked fine.

After the encrypted error though I formatted and flashed LineageOS 17.1 and then magisk and still keep getting error 1. Even tried Lineage recovery and still same. I think maybe a problem with Magisk 16.

EDIT: I used the latest Magisk 21 and it worked!

 

[TheMighyLoki]

HELP SEE ABOVE

 

[frohro]

Help please!

I followed the instructions here, and got to the place where I was updating things. I updated TWRP using the app, picking the correct TWRP for the h918, and then I updated Magisk too using Magisk and the recommended way of installing. It flashed Magisk and I said it could reboot, and now it is in a bootloop. I can't get into recovery, download, or the regular OS. It will go into fastboot mode, but that is it. Does anyone have any ideas?

Thanks,

Rob

 

[WE#GO#]

@frohro Have you solved your issue?

 

[FeNo2]

TIP : IF YOU FACE ANY ENCRYPTION ERROR AFTER USING STEP2. SH, DO A ADVANCED FORMAT WITHIN TWRP AND FLASH MAGISK AND LATEST TWRP BY PHOENIX MANUALLY.

@kish9046 Could you elaborate a little more about the Advance Format (WIPE)?
When I select Advance WIPE in TWRP, it gives me a list of partitions, none of them are selected by default.
I've tried Data, Cache, Dalvik, and Internal Storage. Did not choose System.

Anyway, after choosing the ones I've mentioned above, and flashing the zip for Magisk, I still have the same encryption error.

Also confused about

FLASH MAGISK AND LATEST TWRP BY PHOENIX MANUALLY.

Isn't TWRP already flashed? That's where I just did the Advance Wipe from correct?

Thanks!

 

[FeNo2]

@kish9046 Could you elaborate a little more about the Advance Format (WIPE)?
When I select Advance WIPE in TWRP, it gives me a list of partitions, none of them are selected by default.
I've tried Data, Cache, Dalvik, and Internal Storage. Did not choose System.

Anyway, after choosing the ones I've mentioned above, and flashing the zip for Magisk, I still have the same encryption error.

Also confused about
Isn't TWRP already flashed? That's where I just did the Advance Wipe from correct?

Thanks!

Ok, I cleared up some of the confusion myself.

On the main TWRP menu, there is Advanced, that is not what to choose.

From the main menu choose WIPE, then you will see 2 buttons:

• Advanced
• Format Data (Choose THIS), THEN type 'yes'.

Then back at the main menu I selected INSTALL and installed Magisk-v16.0.zip.

This fixed the Encryption error. I did not need to install TWRP, it still works.

 

[zeroderp]

double post.
maybe curb my enthusiasm a little....

 

[zeroderp]

edit

 

[FeNo2]

when i open a USB jump drive writer, it only see's the twrp.img file.
not the FWUL.zip i did download per instructions.

Are you using RUFUS to write the image file to your USB jump drive?

seeing as how i am already on a linux distro, is it possible for me to start at step 4, and use that FWUL.zip ?

From the original thread, the OP says this:

If you deviate from this procedure, and think: "I can just skip a step, or I can do this on my own Linux install". Don't complain if you brick your phone.

It's possible to use your own Linux install, but not recommended. The bootable jump drive image has safeguards built in, AND it downloads additional files. You're much better off using it.

 

[zeroderp]

Are you using RUFUS to write the image file to your USB jump drive?



From the original thread, the OP says this:


It's possible to use your own Linux install, but not recommended. The bootable jump drive image has safeguards built in, AND it downloads additional files. You're much better off using it.

so, one thing i just realized was the zip image was not a flash image,,like lineage17.zip,
it is a zip file that needs to be unzipped,,THEN it is a .img file that can be installed on a jumb drive

i derped out pretty hard on that.

you mentioned this fwul downloads aditional files????

PLEAS tell me the PC does not need to be connected to the internet while i am flashing the phone.....

am rebooting the programmer pc with fwul now....*scary music*

 

[FeNo2]

so, one thing i just realized was the zip image was not a flash image,,like lineage17.zip,
it is a zip file that needs to be unzipped,,THEN it is a .img file that can be installed on a jumb drive

i derped out pretty hard on that.

you mentioned this fwul downloads aditional files????

PLEAS tell me the PC does not need to be connected to the internet while i am flashing the phone.....

am rebooting the programmer pc with fwul now....*scary music*

Sorry, it needs to be connected to the internet. It grabs a file from github. The flashing to your phone during that part is very quick. I don't recall what it's doing, but it's not anything large. I just did this last week, but I've kind of forgotten exactly what happens.

 

[zeroderp]

Sorry, it needs to be connected to the internet. It grabs a file from github. The flashing to your phone during that part is very quick. I don't recall what it's doing, but it's not anything large. I just did this last week, but I've kind of forgotten exactly what happens.

i am very much in a less then 3rd world country circumstance. connecting to the internet is almost impossible as it is under excellent circumstances. for me to reboot into a Live os, and then set up a full NIC config before the Live freezes, glitches out or other wise kicks me in the face is almost impossible.

i am guna try to make an install. drag copy everything from the install to my os. this arch distro is built super similar to parrot os, so i might be able to make something work.

time will tell.

 

[zeroderp]

so far i have a failed atempt at this point
--------------------------------------------------------------------------------------------------------------------------------

[email protected]:/home/lglaf$ cd lglaf
bash: cd: lglaf: No such file or directory
[email protected]:/home/lglaf$ sudo git checkout h918-miscwrte #for the TMO V20
error: pathspec 'h918-miscwrte' did not match any file(s) known to git

--------------------------------------------------------------------------------------------------------------------------------

the lafsploit is not able to "get" from the hub. looks like files have been removed?
now how do i get what i need?

took me an hour and a half to run less than 10 cmd lines.
not to mention thes fails are forcing me to unplug a phone while in download mode.

this is not fun.

 

[zeroderp]

any one know where i can download the file "h918-miscwrte"
looks like it is no longer on github


[email protected]:/home/lglaf# git pull
Already up to date.
[email protected]:/home/lglaf# git checkout h918-miscwrte
error: pathspec 'h918-miscwrte' did not match any file(s) known to git


hard thing waiting.