also anyone with U1541U (no plus) should try too.
Please be more clearer: Do you mean the very first 1541 Ultimate? Well, it does not provide EAPI support at all. Or do you mean the 1541 Ultimate II without plus? I can test your new version on TC64, 1541 U2, 1541 U2+, Ultimate 64, KFF and Easyflash 3 the coming Saturday.
Edit: Well, I could also test on Ultimate 1 with Ethernet, but that makes IMO no sense because lack of EAPI support.