It does accept OSD updates (The existence of the TDB startup cards is the proof), but one cannot transfer the update files between a Debugstation and a retail PlayStation 2 (Decryption will probably fail, and the update will get rejected) because something was done to make the bound KELFs (for TESTs) not compatible with the retail units. I'll probably work all TEST unit models, since it doesn't involve the console's Magicgate mechanism. I did hear from a reputable source that FMCB v1.92 doesn't work on a DTL-H30101 unit. I don't have a DTL-H30100 or DTL-10100 (and neither do I know of any special requirements by these consoles), and so I never tested nor designed the FMCB v1.9 series for use on one. Their boot ROMs have a 'lite' SECRMAN module (secrman_for_dex) too, one that also lacks support for decrypting KELFs. In the DTL-H10000 and DTL-H30000 series units, the MECHACON lacks support for the KELF decryption Magicgate commands. or rather, I should just say that they can boot an OSD update, but FMCB may still not boot because it was designed with only retail consoles in mind.

On the other hand, the DTL-H10100, DTL-H30100, DTL-50000 and DTL-70000 series are fully capable of booting FMCB. The DTL-H10000 and DTL-H30000 series are incapable of booting FMCB due to a lack of a full Magicgate implementation (No KELF support).

Update fmcb ps2