[LG V20 Guides, News, & Discussion] ahlok_hk:
I have successfully root H990DS with the following steps. I try to make it as detail as possible.

(A) Check model and version

- Make sure your phone model is H990DS. If model is different this rooting procedure is not for your v20.

Settings > General > About phone > Common > Hardware Info > Model Number = LG-H990ds

- Make sure your v20 security patch level is before 2017. If patch level is not before 2017, perform step (E)1.

Settings > General > About phone > Common > Software Info > Android security patch level

(B) As this root method will format data, make sure you have backup your phone data onto a desktop/laptop computer. If you backup to SD card, the SD card must not be encrypted! (failures will destroy the key and the data)

(C) Ensure you have ADB/Fastboot files installed and working: https://xdaforums.com/sho....php?t=2588979

(D) Make sure adb working with the following steps

- Unplug sync cable

- Enable developer mode in setting menu (click "Build Number" 7 times)

- Set USB debugging -> On

- Plug your device into the computer again and verify ADB is working by typing in adb folder "adb devices" (should show LGH990?????? Device)

(E) Download the required files

1. if your security patch version is after 2016, get kdz for 10c and LGUP for "UPGRADE" the firmware

2. Downloaded dirtysanta's files (https://xdaforums.com/v20/development/ls997vs995h910-dirtysanta-bootloader-t3519410) and copied them to ADB directory. (can delete boot1.img and boot2.img, Step3.bat and Step3.sh)

3. Downloaded h990 TWRP (https://build.nethunter.com/test-builds/twrp/lge/twrp-3.0.2-1-h990.img) and copied them to ADB directory

4. Choose and downloaded one of the emdroidle's kernel zip file from this post (https://xdaforums.com/v20/development/dirtysanta-h990-t3624296) into SD card; (emdroidle's step3_h990.bat is not required)

5. Downloaded SuperSU (https://xdaforums.com/apps/supersu) zip into SD card

6. put SD card into the device

7. Installed Terminal Emulator App (https://play.google.com/store/apps/details?id=jackpal.androidterm) on device.

(F) Disable antivirus (if necessary)

(G) Using dirtysanta's steps: Run

RUNMEFIRST.bat

<-- Do not close the command window as we will need it in later step.

(H) Run command prompt, change folder to adb folder and type

step1.bat

<-- Wait until you can type something again.

(I) In the "Step 1" command prompt, type

run-as con

<-- If you get unknown package error, means your latest security patch patched it out (can be avoided if you have performed step (A)), boohoo no root. If you can find an earlier firmware KDZ for your device, LGUP should be able to install it and you'll be able to root.

(J) In the "Step 1" command prompt, Type

chmod 0777 /storage/emulated/0/*

(K) Start Terminal Emulator App at the device and type

id

(L) At Terminal Emulator App, look for something containing "untrusted_app". If not found, Start all over again. If found, continue next step.

(M) At Terminal Emulator App, type

applypatch /system/bin/atd /storage/emulated/0/dirtysanta

(N) Wait for RUNMEFIRST.bat console to prompt you to run step2.bat.

(O) Run command prompt, change folder to adb folder and type

step2.bat

and wait it to finish

(P) Run command prompt, change folder to adb folder and type

fastboot flash recovery twrp-3.0.2-1-h990.img

and wait it to finish, then wait further 30 seconds and run the same command again and then wait for another 30 seconds to enable the command to execute completely.

(Q) unplug sync cable, pull out battery wait 5 seconds and put back afterward

(R) boot in to TWRP.

Press and hold volume DOWN; press and hold power until the LG logo comes up, then briefly release power (0.5-1.0sec) and then hold power again.

You will then be prompted "Delete all user data and reset all settings?"

Select ""Yes"" twice, and as long as TWRP installation was successful you'll get into TWRP and NO RESET will be done.

(S) Once in TWRP, Press Cancel on the password prompt and then swipe to allow system modifications.

Note:If you wish to make a back up now, you MUST save it to your SD card, and you cannot backup the data partition.

(T) After the backup is complete, return to the main menu

- hit "Wipe"

- Swipe to Factory Reset

- click Format Data and type "Yes" to start format

- Install Kernel.zip

- Install SuperSU.zip

- Reboot

(U) During reboot you will get a Red Triangle with a "!" inside, this is normal (The first boot after flashing SuperSu will even show the Red triangle two times before system completely boot (this will take awhile)). It may appear like the system has frozen but it has not. JUST WAIT!

(V) Check if SuperSU App is installed. If yes then your v20 H990DS is rooted!

(W) enable antivirus if your disabled at the beginning

Hope this will help for rooting the H990DS. If there is any step missing please let me know.