D6633 IMEI:null but after 1 min IMEI appears and No Service !!

hey guys,,
i got that D6633 with IMEI problem ,,
when i restart the phone and request IMEI info via *#06# then IMEI:null ,,
but after 1 min when i repeat the request IMEI appears !! ,,
the problem is i can't call or receive cuz it's always "No Service" ,,
i've tried to flash the phone with Flashtool and SeTool Box with different FWs but same problem ,,
also tried to backup and restore TA but didn't help at all ,,
so, is there a solution for this weird problem ??

Also, check this video for another person suffering from the exact same problem ..
https://www.youtube.com/watch?v=vFsAC9UR_eo#t=31

Thx in advance.