The bootloop I solved after
I formatted /system. I even restored my previous cm10.2.1 backup which was on 4.3 and I did a manual factory reset from settings. Then I formatted data, cache, dalvik and still nothing.
Sent from my SCH-I535 using xda app-developers app
Phone: SCH-I535 (Verizon SGS3)
ROM: Gummy-M3.0-07-21-14 D2LTE (nightlies)
Kernel: 3.4.94-gummy-g833314 build (7/21 build date)