mobile

So I have a unique situation. I have an S4 with an MDB or MDL bootloader (don't remember what I had when I left stock ROM behind) with a 4.4.2 GE ROM on it (using Loki). My recovery is TWRP.

I did flash an MF3 radio if that matters.

I need to SIM unlock the phone but none of the methods I've tried (including Regionlock Away) work on this GE ROM.

I know if I return to a stock (rooted) ROM I can run RegionLock Away or use a few methods here but I want to do this the fastest/easiest way possible and get back the phone back onto a new 4.4.4 KK ROM (waiting a bit for LP).

Anybody have any suggestions for a rooted & defanged but generally stock ROM I can flash temporarily? I need the CSC data to be intact for RegionLock Away to work.

Seems like most of the older ROMs out there are broken links at this point and all the newer TW ROMs I've seen are for SafeStrap (plus they have been heavily modified)

I know worst case scenario I can ODIN back to MDL (probably flash MDL radio first just to be safe) then re-root but I don't even have all the tools for that anymore (I originally rooted using a work PC I no longer have) and I suspect a lot of what I need will be broken links since they were last useful for most people in 2013.

Anyways I'm just looking for the shortest/easiest path to SIM unlock (without paying for a code). I did try the official AT&T but I'm still under contract for another month so they denied. I want to use the phone for a T-Mobile test drive next week.

Thanks for any advice/suggestions.