There is a version of other devices POSP ROM on the latest Android OS that has become available for download and installation on the OnePlus 6. The ROM is still in the pre-beta phase of alpha, so it is often not suitable for daily use on your primary phone. The front camera may not work, in addition to some other bugs and problems with the stability of system functions. So, if you want to experiment, you need to make sure that you can deal with these things first.
First of all, you need to download the official stock ROM from the above-given link to flash your device. You may also repair your 7 Pro Android device using Stock ROM Firmware Flash File.
Evolution X 5.1 is a custom ROM based on the latest Android 11 update. The ROM is created and maintained by Strotum and is available on a number of Android phones.
On average it should take you around 7–10 hrs to download the android source code. LineageOS ROM unofficially supported for Redmi Note 4. It means you will not get regular OTA updates with that custom ROM. LineageOS ROM Android 11 based custom ROM of Redmi Note 4 Pro builds by the Zeelog developer of XDA. OnePlus 3/3T comes with a flexible bootloader other than Verizon devices. Verizon devices come with a locked Bootloader, meaning we can easily root different smartphone variants.
Users looking to install that on their phones and developers are looking to support their apps on this latest version of the OS. However before proceeding please make sure that you have made a complete backup of your phone storage so that you can recover from a worst case scenario.