The Marvell processor in this tablet is notoriously difficult to develop for because of a lack of upstream support, which limits kernel development to very old versions (e.g., 3.4.113 ).
If you are performing this work yourself, the standard procedural steps documented by the community include: smt210r lineageos work
If you are looking to move away from the sluggish stock firmware, consider these community-driven options: Android 9.0 Pie (LineageOS 16.0 Unofficial): This is one of the more modern ports available for the The Marvell processor in this tablet is notoriously
To flash custom ROMs, you must replace the stock recovery with TWRP. smt210r lineageos work
If you get LineageOS booted on the SM-T210R, the "work" shifts from installation to maintenance. Common issues reported by users of unofficial builds include: