I wasn't paying attention to the model numbers I was looking at and tried to install an N7100 ROM on my SGH-T889. I installed it, fudged my IMEI and tried to rollback to the previous ROM I had in place but it didn't resolve my IMEI unknown issue. I tried to restore my backups, nothing. I have tried multiple stock firmware versions for my phone I have found on here but ODIN fails on every single one, most of them sitting at boot.img, MD5 hash invalid or getting stuck on system. I am unable to get into recovery, only the download screen. I think because the ROM I tried was 4.3 it messed up my bootloader and wont let me go back to 4.1.2 but I cant put anything on it at this point. Ive tried multiple versions of ODIN, different USB ports, cables, rebooted my PC and Im out of ideas at this point. I apologize in advance because I'm sure the answer is out there I just cant find it and I've been looking for a few days.
Its possible that when you tried to flash 4,3 rom you also ended up with the stupid KNOX security thing. Which means you cant go back to older roms only 4.3. (as far as i know, im still a bit of a noob with this stuff)
It might be usefull to post what you get on the screen when in download mode, hat will give people more info to help you with i guess.
I did a similar thing too you a while ago and lose my imei and such, i cant exactly remember how i fixed it, i think i just flashed a stock from from sammobile.
If you havent tried that, then go here http://forum.xda-developers.com/show....php?t=2032849
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