Writing IMEI on new MT2502 IC


I’m making my on GSM board using LinkItOne. The rest of board is working okay. GPS and sim card. But when i try to read IMEI number of MT2502 IC that I mounted on my board, it shows no IMEI number. When I try to read IMEI number of LinkItOne board, it shows me same IMEI number written on LinkItOne board. My question is how can I write IMEI number to new MT2502 IC. I can’t find any API to write IMEI number on MT2502 IC.

Waiting for response.

Thanks in advance.