I'm not using CF cards ATM; thanks for your answer.
I had checked with
BIOS list on Sega-Naomi and GD-ROM for Naomi 1 seems to be only supported for BIOSes higher than 21576E, but was wondering if a certain DIMM board firmware version required a particular BIOS version.
Anyways, I found I had some BIOS versions not listed there (21577G, 21578D, 21578G, 23608, 23608A, 23085). Is there interest in a dump of them?