recently it was confirmed that upgrading your Naomi Dimm board is possible using the appropriate revision Dimm Upgrade Disc and security IC from the game you need to update firmware for, example: upgrading to 3.17 to use Virtua Fighter 4 Final Tuned needs to have the security IC from VF4FT Version B
my theory was if the dimm boards need an IC chip aswell as the update disc it would most likely be for the game you need to update it for, in this case VF4FTvers B.
this was confirmed thanks to powervr777
powervr777 wrote:To update DIMM FIRMWARE for VF4FT, you need "GDS-0023E" and VF4FT sec chip.
"GDS-0023E" is bundled disc of VF4FT conversion kit, and work only with VF4FT sec chip.
For your reference, "GDS-0023A" and "GDS-0023C" are older version.
A is for VF4 and C is for VF4EVO.
So, they are not suitable for VF4FT.
hopefuly powervr777 will drop into this thread and post more specific information like other GD upgrade serials and info, but for now, at least we know how to do it.