The FPT tool is based on the ME FW version, in this model the SPS 3.xx.
The access to bios region, at least, must be unlocked for writting operations.
Some motherboards have a jumper for ME service, enabling the access.
Also a dump with this tool/other method, is advisable for safe keeping an spi/regions backup before flashing mods.
But better read some posts…
[request] Modded bios for Tyan S5533 MoBo - Important Drivers / General: Storage Drivers (AHCI/RAID, NVMe and USB) - Win-Raid Forum (level1techs.com)