To update a Samsung Galaxy Tab 2 10.1 (GT-P5100) Android 7.1.2 (Nougat)
Flashing the wrong firmware can (render it permanently dead). download samsung tab 2 10.1 gt-p5100 android 7.1.2 firmware
You cannot install Android 7.1.2 using the stock recovery. You need TWRP (Team Win Recovery Project). To update a Samsung Galaxy Tab 2 10
You can do this wiping (if files already on SD card) or after wiping using MTP: download samsung tab 2 10.1 gt-p5100 android 7.1.2 firmware