Write the IMEI number 123456789012345 to IMEI slot 0 of a device of the nRF91 Series with the serial number 1050993570:
nrfutil 91 imei-write --modem-firmware mfw_nrf91x1_2.0.1.zip --serial-number 1050993570 --slot 0 --imei 123456789012345
For safety reasons, the example command does not include the --force option.
To write the IMEI number, add --force to the command.