Default [Q] p5100 can't install CM11

i have a galaxy tab 2 10.1 (p5100) with CM10.1 and CWM V 6.0.2.7
when i'm trying to install any nightly version of CM11, manualy or through CM update, the device just get stuck and return to the recovery.
does anyone know what can i do about it?
p.s sorry about my poor english