I've found a bunch of references on seller sites that the "generic FMCB cards" dont work on 30001 (google: free mcboot card not applicable to the 30001 model, or
https://www.walmart.ca/en/ip/Memory...or-PS2-PlayStation-2-Free-McBoot/6CSY1E9N71OM ), which is odd, because FMCB is supposed to work on that revision.
And its not even the version of the FMCB install they are selling, I saw that warning on "older" versions as well.
Best I could come up with is, that its a strange interaction with 64MB (or generic MCs?) in general?
See:
https://www.reddit.com/r/ps2/comments/b5g2d5
As you have another console, try to get FMCB installed on an official Sony memorycard, following the 'official' setup tutorials and see if that works.
edit:
With FMCB there is a normal installer and a multi console installer. If the multi console installer doesnt work on a Sony memory card, try to get the normal installer (installs FMCb for that revision of the console only) on the 30001, using "another hacking method", on the 30001 console as well. Maybe.
