I just want to send out a warning for 2013 Mac Pro users NOT to try and update to Monterey Beta 8!!! It does NOT work, and it toasts your Mac Pro. You start the install, the Mac Pro reboots, and then it hangs. You can reboot all you want, it does not get any further than about 30%. You cannot go into Recovery, as it doesn’t exist, and you cannot restore from Time Machine. The ONLY solution I found was using another Mac to download Monterey Beta 6, create a USB installer, and then install Beta 6 ”on top” of the failed Beta 8 installation. That works.
The result is of course that you are back to Beta 6, and you can’t update to Beta 7 anymore. Hence, you need to stay away from Beta 8. Several people have reported this issue.
If anyone has the Delta Beta 6 -> Beta 7 installer, or a Beta 7 install file I can make a USB installer from, I’d very much appreciate a link.