Insert your microSD card containing the ROM and GApps zip files into the tablet. In the TWRP main menu, tap . Tap Select Storage and choose your MicroSD card. Locate and select your Custom ROM zip file .
My first step was research. The Tab 3 SM‑T211 had a small but stubborn community — threads on XDA that had been posted years ago and kept alive by comments like moss. There were a few custom ROMs that supported the device: lightweight Android builds stripped of bloat, a couple of LineageOS forks scaled back to fit the tablet’s modest RAM, and a handful of experimental ports using kernels tweaked for battery life. Reading was half the ritual: changelogs, user reports, warnings in all caps. “BACKUP,” they said. “YOU DO THIS AT YOUR OWN RISK.”
Install the official Samsung USB Drivers on your Windows PC.