Default [Q] Lost imei and showing null null 7105

i have a note 2 7105, Ive been installing roms 1000 of times, not rly sure what im doing to be honest but now i went from 4.3 to 4.1 or something cause i bought a galaxy gear etc etc... Flashed the 7100 rom accidently and lost access to simcard, baseband is showing unknown and tried a few with no luck. im on dn3 ditto 4.3 now and gotten wifi to work with devil, but simcard still dosnt work, i did the same mistake a long time ago, and managed to fix it (with modem files) i think. But cant remember how to get the simcard up and running again Sorry for my poor explanation and would be happy if some1 had a solution