OmniROM
Lollipop – Android 5.1.1
ROM details.
Based on Android 5.1.x Lollipop.
Using Linux 3.0.x as its ROM Kernel.
Steps to install OmniROM Android 5.1.1 Lollipop ROM on Samsung Galaxy Tab 2 10.1 P5100
Flash TWRP with Odin, if you have original recovery.
Step 1. Download ROM, SU and Gapps zip files to your PC
Step 2. Now transfer the files to your Galaxy Tab 2, by connecting your tablet to computer with a USB cable, then locate the zip files on your tablet SD card root folder.
Step 3. Power off your tablet, then unplug it from USB cable.
Step 4. It is time to enter recovery mode, do so by utilizing these buttons; Volume Up + Home + Power.
Step 5. When you are in TWRP recovery, perform some cleaning, firstly do a wipe data or perform factory reset
Step 6. Now it's time to flash the ROM to your phone, just select the flash / Install zip from SD card .
Step 7. Choose zip from sdcard.
Step 8. Now browse to find the ROM zip file on your SD card root folder.
Step 9. Installation process will start, just wait till all the procedures are complete. After this, flash Gapps and SU in thist order exactely like the ROM.
When it's finish, choose reboot system now option from recovery to reboot your tablet.
Great! You just finished flashing Android 5.1.1 Lollipop OmniROM on Samsung Galaxy Tab 2 10.1 P5100 just check it out through About from Settings area.