Hi , i need a little help I have a Asus memo pad HD 7 ( Bought from PC world about 4-5 month ago)

Problem is i rooted it and installed pimp my ROM edited the DPI settings, restarted and sometimes it boot-loops. When i factory reset from recovery it boots up and says...

Android System UI has Stopped
Launcher has Stopped
Audio wizard had stopped

error after error i can't do nothing at the moment i some how need to restore the firmware but i don't know how. Bad thing is i never made a backup.

Any help would be appreciated on what i could do to resolve the problem