Unlike Dell or HPE, Fujitsu does offer a 30‑day trial for iRMC S4. You either buy or do without.
There are two official channels for acquiring a new license key. fujitsu irmc s4 license key new
ipmitool -H <iRMC_IP> -U admin -P <password> raw 0x32 0x88 <key> Unlocking Remote Power: The Ultimate Guide to the
The license allows you to see the server screen as if you were standing in front of it. You can access the BIOS setup, configure RAID controllers, and watch the boot process remotely. -U admin -P <
If you aren't looking for a "hacker story" and just need the hardware to work, here is the current path for a new key: