Hi all,

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

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.

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.