Exclamation Help me pls : problem when updated to cm 11

hi...
I am new here ...
i have a quite big problem..

i have an htc one xl..
i flashed stock with cyanogen mod 10.2 rom with cwm recovery and it works fine ..
yesterday i tried the update cyanogen mod 11 snapshot m7 by updating via settings>about phone>cyanogen mod updates.
i have successfully downloaded and clicked on it and it got rebooted and installed.
but after that, when i rebooted, my phone got stuck on the blue cyanogen mod spinning logo. thinking that the update file may be corrupted, i restored nandroid backup via cwm recovery. but after that, it got stuck on htc one x logo..

help me guys pls ...

my whole data is there in it..