I rooted my AT&T S4 (SGH-i337ucufnc1) successfully, installed Safestrap without any problems. Then, like a genius, forgot to do a wipe for a clean flash...on top of flashing over my stock ROM. Of course, now there is no OS, and I can still put my phone into recovery and download mode, but only the factory recovery--the Safestrap lock and "Custom" screen come up when the phone starts, but it doesn't go past that.
I DID make a backup and tried to recover through Safestrap with it (before restarting my phone and losing access to Safestrap altogether), but that failed, also. I kept/keep getting the "E:failed to mount /system (Invalid argument)". When trying to recover from my backup, Safestrap wouldn't allow me to check the "system" backup.
I've tried flashing the stock ROM and re-partitioning with the stock .PIT, but everything I've tried to do through Odin gives me a failed result.
I'm really hoping I just missed the solution to my problem and it's already been resolved for ten other people because I'm about to just beat my bricked phone with a brick--or myself for my carelessness.
Oh, this is the output I'm getting from Odin on any recovery I try to use:
<OSM> I337UCUAMDL_I337ATTAMDL_I337UCUAMDL_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/006> Odin v.3 engine (ID:6)..
<ID:0/006> File analysis..
<ID:0/006> Get PIT for mapping..
<ID:0/006> Firmware update start..
<ID:0/006> NAND Write Start!!
<ID:0/006> FAIL! (Auth)
<ID:0/006> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)