> Hello -
> 
> I have an OpenBSD 7.0 amd64 machine with FDE I'd like to upgrade to 7.5.
> However, serial redirect is not working booting 7.5 bsd.rd.  It also doesn't
> work with 7.4 bsd.rd.  7.3 works though.
> 
> Not sure if this is a bug, if I need to upgrade differently.  Do I need to
> upgrade to 7.3 first?

Yes, there have been changes in the way serial console information gets
passed to the kernel by the boot blocks. Try not jumping too many
releases at once.