what 3rd party boot mgr is required to boot multiple freebsd versions?

[Andrey Fesenko]

On Tue, Mar 17, 2020 at 1:24 AM Chris <bsd-lists at bsdforge.com> wrote:
>
> I'm attempting to boot multiple versions of FreeBSD.
> I started with an install of older 11 with a (u)efi
> boot partition installed. I then grabbed an current 11
> usbstick, and installed that. Which stated it needed to
> install a (u)efi boot partition. I let it do it. But the
> new (additional) install doesn't show up at boot. Altho
> my UEFI BIOS sees it.
> I guess there are just too many uefi bios versions,
> and too many changes in the FreeBSD uefi boot code
> to expect consistent results over the long haul.
> Should I just convert the 1st efi (GPT) boot partition
> to a PMBR, and delete the second efi partition. Or is
> there a recommended bootmanager I can use to boot multiple
> versions of FreeBSD? Windows?
>

upgrade system and use
https://www.freebsd.org/cgi/man.cgi?query=efibootmgr&sektion=8&manpath=freebsd-release-ports
;)