I was trying to downgrade my GT-I9505 to 4.2.2 jellybean using Odin. This is the complete list of messages on Odin:
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9505XXUDMH6_I9505OLBDMG1_I9505DXUDMH6_HOME.tar.md 5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/016> Odin v.3 engine (ID:16)..
<ID:0/016> File analysis..
<ID:0/016> Get PIT for mapping..
<ID:0/016> Firmware update start..
<ID:0/016> NAND Write Start!!
<ID:0/016> FAIL! (Auth)
<ID:0/016> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
Now my phone is stuck in Odin mode with the message: "Firmware Upgrade encountered an issue. Please... recovery mode in Kies."
I'm using the September version of 4.2.2 firmware for Singapore downloaded from Sammobile (I cannot attach links as I'm new here)
Tried different USB ports, 2 different cables.. Just haven't tried on a different machine. Not sure if it's an issue with the firmware or what. Any help would be greatly appreciated!!