Default stock rom

hi friends. after using many custom roms i wish to go back to my stock rom on my p500 i have no idea what to do .a senior member in xda says not to use kdz updater then what is the another way.i have a flashable stock rom bit it have lots of bugs som times the toch screen wont work so plzzz help me as soon as possible

Sent from my LG-P500 using xda app-developers app