On Monday, June 19, 2017, Theo de Raadt <dera...@openbsd.org> wrote:

> > I get the error Message that "installboot: /mnt/usr/mdec/biosboot extends
> > Beyond sector 268435455. OpenBSD might not boot." I'm dual booting with
> > Windows using Windows' boot loader first.
>
> You've created an OpenBSD MBR partition too far up your disk.  It
> won't work in legacy mode.  The BIOS won't be able to read it.
>
> You can try EFI mode instead.


It used to work fine for many years and upgrades. I don't think it's new
enough to have EFI.

In the worst case I'll reinstall on the backup HDD.

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