fastboot command error

[mmt-10]

I refer to https://github.com/nxp-imx/meta-matter#security-configuration-for-matter and try fastboot command.

However, I got error as below. How do I resolve it?

i.MX8M side

switch to partitions #0, OK
mmc1 is current device
flash target is MMC:1
Net: eth0: ethernet@30be0000
Fastboot: Normal
Normal Boot
Hit any key to stop autoboot: 0
u-boot=> fastboot 0

Host side

$ sudo ./fastboot oem set-rpmb-hardware-key FAILED (remote: 'unrecognized command') fastboot: error: Command failed

Then, i.MX8M outputs below message.

command oem not recognized.

Emvironment

$ ./fastboot --version
fastboot version 34.0.0-9570255
Installed as /home/muto/platform-tool/platform-tools/fastboot

Host OS : Ubuntu 20.04