[Q] Galaxy note IMEI problems

Hi, First off all, i've searched the whole day after solutions before posting this tread... So be helpfull please.

So, after I Flashed, rooted and updated my Galaxy note GT-N7000 to android 4.2.2 it worked nice for a couple of hours... and then suddenly i lost connectivity. i restarted and the phone didn't ask my pin nr... So after some research i saw that my IMEI was changed to "004999010640000/01"
That could be the possible reason why my phone doesn't detect any sim card anymore.
Anyway, i've done a lot of things to solve it today, even a downgrade to 4.1.2
Things i've tried:
http://forum.xda-developers.com/showthread.php?t=1264021
http://gsm-fahim.blogspot.be/2013/02/samsung-android-repair-efs-imei-repair.html
and some other things... But none of them helped... :s

Can someone help me out please? :s

Phone specs:
Galaxy Note GT-N7000
Android version: 4.1.2
Baseband: N7000XXLSO
Buildnr: JZO54K.N7000XLSZ

i would love it if my phone would be fully restored to zero, so it would be like, brand new from the box...

Greetings!