the krikzz spoofers are good, shame i had to create an account a while back to tear a new arse into the two-way set up.
1, as common sense dictates, look at what's available, place order and DOWNLOAD the relatives os files for the card(s).
2, when the card(s) arrive, apply the download, utilizing the prepared end user instructions.
3, profit!

at least it went that way with the n64edv2, no fuckin problems.
the megaeverdrive on the other hand, unbelievable.
a mess of files, and no clear path, so i destroyed the card in the end.
a friend (whos getting a chunky ps2 as a show of gratitude) saw my subject there, TOTALLY understood, linked me his path of 'trial and error' bullshit for the same card he had.
he gave me his med as he was selling his sega stack.
left the route he took as reference to others there. (card works great.)
i hope like the n64edv2, it's just as fluid as experience if i get other cards from there, it was the distro (his endorsed) NOT linking the correct med os files vs the ones that was sold.
i haven't checked, but kirkzz is quite anal, and builds a quality product, and i trust on blind faith that such endorsed distributors DO properly link to the correct files in future.

...
have a good one all.
