LineageOS 16.0 (Android 9.0 Pie) is the most stable and functional custom ROM available for the Samsung Galaxy Tab 4 7.0 (SM-T210R).
Generally the most stable and "complete" experience for this hardware. LineageOS 14.1 (Android 7.1 Nougat): smt210r lineageos work
Did you find a newer build of LineageOS for the SM-T210R? Have you managed to fix the hardware composer? Join the discussion on the XDA Developers Forum under “Samsung Galaxy Tab A (2015) – gtaxlwifi.” LineageOS 16
is a classic piece of hardware, but its stock Android 4.4.2 KitKat software has long been obsolete. While official LineageOS support for this device is non-existent due to its limited 1GB of RAM, the developer community has crafted unofficial solutions to keep these tablets functional. The Reality of LineageOS on the You won't find the official LineageOS devices list Unlock bootloader per vendor instructions
Custom ROM Porting "White Paper": For those looking to port LineageOS to the SM-T210R, the Aziro Porting Guide outlines the critical infrastructure required: adding device-specific makefiles, including kernel sources, and debugging bootloader issues.
. While the tablet remains a popular target for "Android afterlife" projects, achieving a fully functional LineageOS experience on this specific model is famously difficult due to its unique internal hardware. The Technical Stumbling Block: Marvell PXA986 The primary reason there is no official LineageOS support is its processor: the Marvell PXA986 Lack of Source Code