Hi all,

I'm trying to flash my S4 I9505 back to stock rom, but get the FAIL! (Auth) error in Odin.

Background:
Somehow someone flashed an I9515L rom into my device and it turned really unstable, so I'm trying to get back to the original. I don't have the version id of what I had before, so I tried a couple roms for I9505 in my country region.

Version:
Odin v3.12
Tried I9505VJSHQA1 and I9505VJUGNI2

Device has been restored to factory and is running I9515L


I'm new to all this so all help is very much appreciated.
Thanks.