Flashed it with ALT-F2, went wrong...
(it did not flash second part)
Thank god boot-rom (or block, what is it?) worked OK and I could flash it with a floppy I quickly made on another PC...
Downloaded it from
www.epox.org (went wrong) and
www.epox.nl (went ok), but I think that's a coincidence since the CRC (and the MD5 made by me) of both files is the same.
It's probably just bad luck or a faulty floppy (also bad luck). But most important: it still works :P