I got my S4 through swappa, and it was already on MK2. I rooted using motochopper and installed safe strap, and that worked (when booting, I could get into the options screen mess with stuff, etc). I didn't install any ROMS since there weren't any I was interested in besides cyanogenmod
In my attempt to install cyanogen mod, I tried installing another recovery, I think TWRP. That earned me the unlocked symbol when booting, and I was stuck in a weird boot loop for a while. I started researching flashing a clean ROM onto my phone, but lo and behold, it actually fixed it's own boot loop and started up again.
That was a month or two ago, before the NC5 4.4.2 update. I decided since it had resurrected itself I would just wait for a bit and see what other tools came out.
After the 4.4.2 update came out, I ignored it for a bit. I tried installing the OTA update once and it went through it's song and dance and after it rebooted it said it couldn't complete the update so nothing was changed. I assume that is because it's rooted? I didn't really force uninstall any apps, I just disabled them through the included app manager.
So where I'm at now is I'm still on MK2, I can't install the OTA update, everytime I reboot my phone I get the unlock symbol and it says "Recovery Booting..." in blue letters at the top, but it never boots into any sort of recovery.
I have tried installing safe strap again and the safe strap app says "State: Installed" but when I reboot it says that recovery booting thing, and then just boots into the regular phone. I don't see the safe strap logo or button options at all.
Where can I go from here? Ideally I'd like to get on a custom ROM that's on the rootgalaxys4 website (it won't let me post links) but I don't know if I have the MDK bootloader, or even what my recovery situation is.
If anyone could help shed some light on this, it would be much appreciated!