Updated to 4.3 EFS went from v1 to v2 and can't get signal on custom roms

Hello!

Phone Gt-i9300

So i was happily using omnirom for 1 year until my motherboard died last week :(
so i ordered a new board. i installed it, it was on 4.1.2 unlocked, and i decided to update it without making a efs backup! so dumb!

So i installed a 4.3 Stock ROM, no signal so i had to install
-Patched XXUFMJ9 kernel
- Patched BUUGMJ3 modem

So i can use my phone with no problems in STOCK....
BUT. I hate STOCK..

I have tried to flash omniroom 4.4.4, but it says unknown baseband, uknown imei.. i tried installing omniroom and then installed again the patched modem buugmj3 and ofcourse nothing happened...

So.. my question is.. Am I forced to stick with this TouchWiz Rom? or is there any way for me to do something to get omniroom detecting my signal?

Oh something i was forgeting.. before i updated to stock 4.3... i installed first omniroom.. but i decided to update to stock 4.3 because i was getting signal but it could take 1 HOUR for the phone to get the signal.. and from there signal would lose at any moment.