They are 2 ways, this is work or not.
1) method
AT*MRD_IMEI=R <- read
AT*MRD_IMEI=D <- delete
AT*MRD_IMEI=W,0,DATE,IMEI <- Write new one, base at first commands
/interface lte at-chat lte1 input="AT*MRD_IMEI=W,0101,11JAN1970,35281**********"
AT*MRD_IMEI=R <- read after change
2) method
/interface lte at-chat lte1 input="AT+EGMR=1,7,\"XXXXXXXXXXXXXXX\""