Originally Posted by graydiggy
As far as I know, BB can't even downgrade... I must know what this software is.
Sent from my SAMSUNG-SGH-I337 using XDA Premium 4 mobile app
The phone can not be downgraded from MF3 to MDL. In order to do so with any "software" method would require at least a partial re-write of the MDL bootloader to completely emulate parts of the MF3 bootloader. Once operational in theory, it would need to be signed with Samsung's encrypted key to make it actually function on the phone. We do not have the encrypted key required to do so. Any other method would require replacing parts of the phone itself.
People that claim this, don't know what they are talking about.
SGH-I337 (AT&T) 32GB
P-ROM (1st Gen.), De-Odexed, AMDL
Auto-LOKI OUDHS CWM
Make sure you read and understand the "PINNED" threads in the "General" and "Q & A" sections of the AT&T S4 forum BEFORE you ask for help. Use the forum's "search" function to find posts with additional information. You should not expect others to help you if you haven't tried to help yourself first. Also, read, understand, and follow the "XDA" rules.