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Reply to Can't install macOS Monterey beta on M1 external drive
My first attempt was like everyone else. A spare partition of 256GB on thunderbolt drive. So I had good backups and decided to install on Internal m1 Mac mini disk. This erased the installer so in terminal I: softwareupdate  --fetch-full-installer which downloaded the installer. The first time I ran it, it errored out. So I ran it again and it installed and boot the new part. This makes me wonder about the deterministic nature of this. So if you run Monterey, you can get an external disk running it.
Jun ’21