lets solve this out!
Originally Posted by panduhcub
I have this same exact issue but with the att g flex. right after rooting my device i also tried the recovery and this black screen came on. i freaked out but after a few times it finally booted up. then i stopped messing with custom recovery. but the other day a software update came on my screen and it did not let me pick whether or not to update it just did it on its own. and said software rebooting. after that is was stuck on the same screen again.
 Fastboot mode started
 fastboot: proccessing commands