LineageOS, the fork of most popular Custom ROM of its time CyanogenMod, is popular amongst custom ROMs enthusiasts. LineageOS team recently announced LineageOS 17.1 and dropped LineageOS 17.1 build for quite a few popular devices including POCO F1. LineageOS 17.1 uses Android 10 as the base, and the team behind had been working on the project since Android 10 announcement in September 2019 but the Permission Hub feature in AOSP conflicted with the Privacy Guard feature available in LineageOS causing the unforeseen delay and making the development team release LineageOS 17.1 instead of 17.0.