The 351Droid project was formed with the goal of porting the LineageOS Android distribution to handhelds running the RK3326 processor. This includes popular devices such as the RG351P, the RG351M, the RG351V, and the RGB10 Max.
If you'd like to test the beta, please check out the Discord for the latest build images and install instructions. Additional details can also be found on the /r/351Droid subreddit. This OS is still in an early beta, so we recommend checking the Retro Game Corps overview embedded above to see if this firmware is right for you.