I followed the thread in the general section to a T, but I keep getting a black screen whenever I flash with flashfire. Not sure of my baseband, but I'm on 4.4.2
That was using the exploit Dan Rosenberg demoed, and has been said time and time again not to work for the S4 in unlocking its boot loader.
Sent from my SM-G900V using XDA Free mobile app
This is a full wipe, perhaps it will work http://www.rwilco12.com/downloads.php?dir=Files/Devices/Samsung%20Galaxy%20S4%20%28Verizon%29%20%28SCH-I545%29/Stock%20ROMs
The problem is your USB settings in the hidden dialers. Look for tutorials on how to enable them, and once found, type *#0808#, and a list of usb otions will come up. Pick any with MTP and they'll work again.
You can't ****ing use goomanager, god dammit read alittle before you **** up your phone. Just boot holding power, home, and volume down, and when prompted press no