: A custom recovery like TWRP 3.0.2-6 or newer is required to flash the new firmware.
: Download the ua_espresso3g zip file from a trusted repository like Android-Andi's GitHub. download samsung tab 2 10.1 gt-p5100 android 7.1.2 firmware
Immediately after flashing, boot into recovery by holding . Step 3: Flashing Android 7.1.2 Firmware : A custom recovery like TWRP 3