Tablet [HELP][P3100]status7 error

Hey guys
I rooted my SGT2 P3100 About a week back
It was on stock ROM ( rooted using cf.root )
A day later I flashed cm10.1.3
SUCCESS
but now when ever I try to flash another ROM
Status 7 error occurs
I tried editing the update.script
But it didn't work
Now I m stuck on cm10.1.3
How do I flash other ROM without getting the error?