Galaxy Tab 2 10.1 (not sure about other sizes) will have its last update at version 4.2.2. it won't get 4.3 or 4.4 except through a custom ROM. it runs CM11 nightlies well but those ROMs are meant for the P5110, not the P5113TX, and require updater-script hacking to flash onto the P5113. the only bug is Google Now placing you in London, England, i am guessing the ROM is meant for international devices. not really sure the differences between those two models
"If you treat your system like a kiln, don't be surprised when a brick comes out the other side."