You can find Marshmallow ROMs on the same XDA section.
This comprehensive guide will walk you through the entire process of downloading and flashing the best Android 7.1.2 firmware for your GT-P5100. Prerequisites and Requirements
Boot into : Press and hold Power + Volume Up (the button furthest from the power key) until a warning screen appears. Press Volume Down to confirm. Open Odin.exe on your computer. download samsung tab 2 101 gtp5100 android 712 firmware best
Are you using a for the setup? Do you have a MicroSD card available?
: LineageOS 14.1 (Android 7.1.2) specifically for the "espresso3g" or "GT-P5100" model. You can often find these builds on LineageOS for Samsung Galaxy Tab 2 XDA Developers Google Apps (GApps) Open GApps You can find Marshmallow ROMs on the same XDA section
TWRP 3.0.2-0 (or higher) .tar file specifically built for the GT-P5100. 4. Android 7.1.2 ROM & GApps
Confirm device model
Look at Odin on your computer. One of the ID:COM boxes should turn blue or yellow, showing a text string like COM3 . This confirms your device is recognized.