Help going back to stock 4.1.2
My friend asked me to flash his samsung galaxy s3 from virgin mobile back to 4.1.2 stock, he updated to 4.3 but its having a lot of troubles with the apps and stuff, I couldnt find a forum featuring the virgin brand here, but it seems to be the same model as sprint SPH-L710. Now I cant find the correct stock rom for his phone and a noob friendly guide to do it using odin. Im not new to flashing but I havent done it in a while and besides I always did it on my samsung galaxy S from tmobile which it has its own forum and everything was at hand and i was always sure I was using the correct files. Can someone point me in the right direction to find all I need to make a nice flashing? His device its unrooted and he doesnt want to root, he also has de 16 gb model if that makes any difference.