Question [Q] iberry CoreX4 IMEI/IMEI CV UNKNOWN, BASEBAND UNKNOWN..NO SIM DETECTION..

Hello,
In My iberry CoreX4 3G tablet after changing rom.. the imei , baseband is showing unknown and the sim is not detecting..
I have googled and found that my imei is lost and for that I had to backup the efs files.. where all the IMEI INFO, WIFI MAC ADDRESS , AND BLUETOOTH ADDRESS ARE stored.. but I have not done backup and also I have no efs files....
When I contacted the iberry Customer Care they say that their tablet does not have any imei ... and now the sim is not detecting ...
I have changed to even the defaut iberry rom but no soloution is there..
PLEASE ANYONE HELP ME IN THIS REGARD...
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