How to change IMEI number in DOBRY fixed wireless terminal?

In our fixed wirless terminal manual, users can find IMEI set command.
*00#056#123451234512345#  or *00#035#123451234512345# Change IMEI. 15 digitals in IMEI number. 123451234512345 stands of IMEI number. Connect fwt to telephone, turn on fwt, and off-hook of phone. Press *00#056# or *00#035# and IMEI number# IMEI number must be legal and valid. Otherwise, modify is not successful. In IMEI number, users can download IMEI software to get. Or ask us to supply.