I found a reference that they fake it with one block of the flash, will look further and update. WX predicts some serious rain this weekend, maybe I can pry loose a couple hours and give it a try now the ST-link module’s arrived.
Here’s the ported library list, including a link to the eeprom emulator. I have some reservations (pending research on flash longevity) about how hard you’d want to hammer on this. Also note in the wiki that the microUSB connector can be flaky, which is pretty standard. Just got a GearBest 1.5w mini laser engraver where the connector fell completely off within a couple days (return to China will kill that warranty, asymmetric shipping cost, negotiating with them about a new board)
Some if them have 64k, some have 128k, don’t know what the 5 I got have.
There’s a wiki for the board: