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List of Best Custom ROM for Lenovo Tab P11 [Updated] (getdroidtips.com) 

Evolution X:

Evolution X is a flashable Custom ROM to bring a true Pixel feel to your Android Device at first glance, with many additional configurations at your disposal. We aim to provide frequent builds with monthly security patches from the latest aosp sources.

Kaleidoscope OS:

Project Kaleidoscope, a new Android ROM project. We focus on code quality, promote localization, and enrich custom ROM features. We also have experienced developers working with us to bring new blood to the Android community in an open manner.

CrDroid OS:

CrDroid OS is a new custom ROM based on AOSP/ Lineage OS built from scratch by adding customization options from AOSPA, Lineage, SlimROM, crDroid OS, and many other great ROMs out there. The ROM brings a lot of customization options along with a Pure Android Experience.

ArrowOS:

ArrowOS is a new Custom ROM and it is AOSP inspired open-source project started with the aim of keeping things simple, clean, and neat. The ROM brings almost the same feature which is very useful for ROM customization and in the end aiming to deliver smooth performance with better battery life.

Project Elixir 3.0 Beta