Boot into TWRP recovery (Hold while powering on). Tap Wipe , then select Advanced Wipe .
: If your tablet gets stuck on the Lenovo logo, boot back into Fastbootd and run the fastboot -w command again. A clean data wipe solves 90% of boot issues.
Before doing anything, back up all personal data (photos, documents, etc.) from your tablet, as the process will wipe the device clean.
The Lenovo Tab3 7 Essential (TB3-710F) was a solid entry-level tablet when it launched, but its stock Android 5.0/5.1 Lollipop software feels incredibly dated today. If yours is sitting in a drawer gathering dust, a is the best way to make it snappy again.
Modifying your device software typically voids any remaining manufacturer warranty.
Unlocking the bootloader and flashing a ROM will completely wipe your internal storage. Backup all photos, documents, and accounts.