About that arm64/aarch64 TIER 1 case ...
This will kinda help you:
Description from the page itself:
up.bsd.lv is a proof-of-concept of binary updates using freebsd-update(8) for FreeBSD 13.0-CURRENT and 12-STABLE to facilitate the exhaustive testing of FreeBSD and the bhyve hypervisor and OpenZFS 2.0, and to help elevate ARM64 to Tier 1 status. Updates are based on the SVN revisions of official FreeBSD Release Engineering weekly snapshots.
Features:
- Kernels are built with the GENERIC-NODEBUG configuration file
- /etc/freebsd-update.conf is modified to use up.bsd.lv
- /usr/sbin/freebsd-update is modified to "xargs" parallel phttpget (Thank you Allan Jude)
- freebsd-update(8) does not output to the $PAGER
Hope that helps.