Eric wrote > Raptor issued a 2.0 update last month I misread at first; the v2.00 firmware is from February 2020.
Commenting on my fall 2018 system's firmware, Theo wrote > Pretty sure that is too old. ... > raptor had to send me new eeproms... I bought some blank flash parts from Digikey, got a BusPirate, installed the v2.00 firmware, and OpenBSD now works splendidly. Sometime soon I'll post more detailed notes at my web site, n2vi.com, in case a fellow traveller someday needs to hike this path. Thank you all for the quick advice and the underlying great work.