If you are a home lab user, you might be tempted. But for any production environment, the risk is unacceptable.
ipmitool -H <iRMC_IP> -U admin -P <password> raw 0x30 0x71 0x01 <license_key_bytes> fujitsu irmc s4 license key
Licenses can be purchased through Fujitsu distributors using the part number S26361-F1790-L244 . If you are a home lab user, you might be tempted
Fujitsu does not sell iRMC S4 licenses as standalone retail box products. You obtain them through official hardware sales channels. -U admin -P <