Without a custom ROM, the SM-T280 is e-waste. With LineageOS 14.1 :
: The standard tool for flashing Samsung firmware TWRP Recovery : Specifically for the (look for .tar format for Odin) . samsung galaxy tab a6 smt280 custom rom top
TechRestore Experts Device Focus: Samsung Galaxy Tab A6 (2016) – SM-T280 (Wi-Fi Only Model) Without a custom ROM, the SM-T280 is e-waste
Top Custom ROMs (recommended order, with short notes) Without a custom ROM