Here's the short version of the situation is as such, everything (Minus the normally buggy camera. I just run 'su pkill -9 /system/bin/mediaserver' whenever the camera gives connection issues, aggravation evaded.), including 4G-LTE, was running nice and fine on CM11, but I saw that CM12 was officially available for my phone (d2spr), I wanted to upgrade from CM11 to CM12, but some features were iffy in CM12 (I don't remember if data even worked, but the camera didn't work, and some other stuff, and I couldn't live with that.), so I then attempted to downgrade. When I finished downgrading to CM11, the phone would boot, to then say something to the effect of "Phone has crashed.", followed by the phone locking up, then rebooting to the same screen. I tried a clean install (Without wiping the personal data.), and now everything is mostly normal, with the exception of the following, there is an optimizing apps process every boot, Google Partner setup crashes multiple times on every boot, and only 1x and 3G work, no 4G LTE, and coverage seems worse than usual. I'd also rather not nuke and repave my phone to get rid of the issues. Any suggestions would be heavily appreciated, as getting no data in 4g zones is painful to live with.
4G-LTE doesn't work on Sprint Galaxy S3 after upgrading to CM12, downgrading to CM11, then a nuke and pave reinstall of CM11?