[LG V20 Guides, News, & Discussion] eaburger:
Installation from Oreo Stock to LO 17.1

Hello, a newiee user over here, looking to give my small grain of sand to this community for first time. I will mention my experience in case any other new on custom rooms want to install the LOS 17.1 on the V20.

I have a H990DS from The Philippines as daily driver (an no other one) this was with the CUSTOM Room from Taiwan installed with LGUP, but the battery life and responsiveness were getting worse every day.

As soon as the first version of the Official LOS 17.1 came out I started to work on it, I followed the steps presented in the official LOS web page (https://wiki.lineageos.org/devices/h990) and with some minors problems that reading some post and redoing some steps I could ROOT (with DirtySanta), and install TWRP to install the the LOS.

Remember to backup (in my case with LG Bridge) I was on Stock not Rooted Oreo ROM and downgrade to Nougat with LGUP, I used the first distribution of the Country where I bought the Phone. But you can found the room in (https://lg-firmwares.com/lg-h990ds-firmwares/#tab=firmwares) for H990. This steps are specified in the post of the bootloader unlooking.

During the Boatloader unlooking and ROOT Process on the H990 (https://xdaforums.com/v20/development/dirtysanta-h990-t3624296): I experience some problems in the first install with the TWRP, but instead of executing 2 times the TWRP installation using Fastboot, I repeat the steps from the beginning and do it 4 times (remember to wait the 30 seconds between each execution and also keep in mind that the Step 1 of the DirtySanta process the do not indicate in the RUNMEFIRST.bat the conclusion to run Step2, so when the Step1 finish in the terminal execute the Step2.

During the installation of the LOS 17.1 (https://wiki.lineageos.org/devices/h990/install), the TWRP could not read the ro.product.device and ro.build.product, to resume the final option to repair this LOS installation and future updates the resolution is to update the TWRP version that is in the DirtySanta steps, I use the last TWRP (a unofficial version) from Phoenix591 that is done for the H990 (https://androidfilehost.com/?w=files&flid=301109) I used the 3.3.1-1 version. With this not only the LOS initial installation, also Kernel and LOS updates install without any problem.

Root and Kernel change, With this I installed Gamma Kernel by Omar (https://xdaforums.com/v20/development/kernel-gamma-kernel-us996-ls997-h910-t3788279), specifically the AnyKernel SS (Secondary Screen by iDefalt), the normal one apart of disable de 2nd Screen give me some responsive problems with the bottom part of the screen, with the 3 recommended .zip (Stock Tasha XML Audio, Stock Thermal Engine and Vulkan Adreno GPU Drivers) also the Magisk 20.4 qith the Manager (https://github.com/topjohnwu/Magisk) for ROOT

Problem with the Camera and sensors, looking the way to test the recommendation from Landoord of the Permissive SELinux using the .zip https://xdaforums.com/showpost.php?p=82181429&postcount=27 after instlling the .zip using TWRP the SELinux was permissive and the Camera and Sensors (light sensor for screen, Flashlight and screen rotation sensor) start to work. The good news is that after installing the next daily update of LOS 17.1 the SELInux returned to a reinforced state, this confirmed in the Trust option of the OS, but the sensors keep working. They have a initial crash but after a restart and until know the are working. In some sometimes the camera have a delay to start but works in WhatsApp, Camera app (LOS, Gcam 6.1 ElDiablo2 version https://www.celsoazevedo.com/files/android/google-camera/dev-alexey070315/#apk1340 with the V20 XML https://xdaforums.com/v20/themes/gcam-6-1-port-cameras-supported-hdr-t4027393 and ProCamX).

A final note: To finish to mention since the first LOS 17.1 installation I never had any problem with the Video reproduction in WhatsApp and only ones until today the screen frees during the night charge, and replying a question in the threat, never going back to STOCK at least in the LG V20 (my first and last LG), their software support sucks! and for daily driver works without mayor problems since the first OS version on April 2nd until today April 7th.

I hope this helps to those like me are new in the Custom room world to give more years of live to our old but good device, and remember the search functionality is your best friend!