When I ran installboot from 1.6.1 on top of the HEAD install, I could get tothe second stage bootloader. But the second stage bootloader crashed, IExact messages might help. ("crash" is too ambiguous...)
I was just experimenting and I didn't write it down. I wasn't too surprised when I saw it after I checked and saw the /boot.atari was still the one from HEAD, so there would be a mismatch between the old primary/secondary and the new tertiary loader. I'm planning to go back and try this scenario with the old /boot.atari. Before I do that I'll get a copy of the error when there's the mismatch.
This is what sysinst does so I see the output a lot but I don't have it written down. I will get it on a HEAD install.Could you try the latest installboot with "-v" option?
David Ross dross%pobox.com@localhost