AC1300 Cirrus Router - IMEI Change AT Command

I tried running the AT command to change my IMEI on the AT1300 Cirrus router, however, now I only see the IMEI appearing as an empty - rather than the IMEI I entered. The command seems to be accepted but does not appear to be working.

Command:

AT+EGMR=1,7,"MY IMEI HERE"

Is this command still correct for this router?

What is the modem? EC25?
Could you give screenshot of the AT command input and return?