[Redmi Note 9S / Note 9 Pro (Indian Model) ROMs, Ke] gigahurts:
LineageOS 18.1 is a free, community built, aftermarket firmware distribution of Android 11, which is designed to increase performance and reliability over stock Android for your device.

LineageOS is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. LineageOS does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for LineageOS is available in the LineageOS Github repo. And if you would like to contribute to LineageOS, please visit out Gerrit Code Review. You can also view the Changelog for a full list of changes & features.

We have progressed to LineageOS 18.1

Flash instructions :

Use latest pbr recovery for miatol, supports decryption - beta available here, https://pitchblackrecovery.com/joyeuse/.

DO NOT - Wipe data!, ONLY FORMAT, otherwise you may hose the phone.

There is a way to fix this without the fastboot factory clean, flash and lock with the official Xiaomi tool, which was forcing you to clean and lock... now available here: https://github.com/Szaki/XiaomiADBFastbootTools

If you hose the phone, use this tool - you need to install JRE though, as the tool is Java base. Put your phone is fastboot, use the tool to download the latest global rom (or whichever). Then go to where its downloaded, extract the .xy/tar file, then go back into the tool and under "image" select the folder INSIDE the folder you just extracted, then select "clean install" and install it. This will flash the majority of imgs but will error out at the end and be unable to create the "user data" partition.

That's okay, because all of the partitions will be setup again, and you can flash any rom you want again. So when its done, and still in fastboot, fastboot flash recovery recovery.img (recovery.img being the latest joyeuse pbr recovery, you renamed to recovery.img and were in that folder in the command prompt, so it will flash that recovery) or use the tool to select that recovery and it will flash it for you and reboot into for you if you like.

(Do this step last, after Magisk, if you want to unencrypt, no worries if you don't unencrypt - PBR recovery will decrypt your data ON THE SECOND TRY OF ENTERING YOUR SCREENLOCK PIN NUMBER...), the new PBR Miatol Beta 10/14/20, fixes this issue, it is now decrypted on the first entry of the phone's lockscreen PIN. Then flash disable_dm-verity_forceencrypt.zip available here for those who want decrypted data partition: https://zackptg5.com/android.php#disverfe and other places as well.

If you are encrypted and decide to unencrypt later, you will need to flash the disable_dm-verity_forceencrypt.zip in miatol recovery, then format data. Store roms, gapps, recoveries (just in case), disable_dm-verity, magisk install and uninstall and all that stuff on the SD card, so you can use them in PBR after you format DATA (the first step after installing PBR miatol recovery), just FYI. Then do the following:

Flash ROM

Flash OpenGAPPS for android 11 nano

Boot into android, make sure its working and install Magisk Manager 8.0.7, then reboot into recovery and install Magisk 21.4 (in recovery, I did not need to extract the boot.img and patch in Magisk Manager, and reboot into recovery to flash the patched boot.img, but your results may be different): https://github.com/topjohnwu/Magisk/releases. If you want to unencrypt (no guarantees its permanent though) you need to format data, THEN FLASH MAGISK, then flash disable_dm-verity (always the last step)- I usually wipe dalvik and cache too.

USE LATEST MIATOL PBR RECOVERY, PLEASE.

SD card issues resolved with the implementation of the EXFat android driver.

Source Code: https://github.com/LineageOS

Kernel Source: https://github.com/Redmi-SM6250 or Stock kernel from Miui

Apologies for the lack of updates, was diagnosed with stage 4 metastatic cancer and this project was not on my priority list anymore...

Update 28/1/21:

Release notes:

LineageOS

Device: Unified (Miatoll)

Developers: ScaryMen1325 & Loptr4

ROM Version: 18.1

Android Version: Android 11

Build date: 22/01/2021

Status: UNOFFICIAL

Changelog:

• Fixed power related issues

• Added useful apps (thanks to Dev: Emulond for that)

• Other fixes and performance improvements

Notes:

• It's 2nd test version, if you found bugs, give log.

• Using loki kernel by default, haven't tested custom kernel.

Download here:

https://drive.google.com/file/d/1M5-cRBfrRdBdNYGzy5G9bOa1Ncf5JkE4/view?usp=sharing

Please note this is a unified release, you should do a clean install unless you're coming from a unified ROM alreadyl.

Will keep you more regularly updated now that I'm out of the hospital....