Ventura docs for M2 Macs in this comment: https://gist.github.com/henrik242/65d26a7deca30bdb9828e183809690bd?permalink_comment_id=4555340#gistcomment-4555340
Old Monterey docs in this old revision: https://gist.github.com/henrik242/65d26a7deca30bdb9828e183809690bd/32c410e3a1de73539c76fa13ea5486569c4e0c5d
Solution for Sonoma: https://gist.github.com/sghiassy/a3927405cf4ffe81242f4ecb01c382ac
Why do you need to unblock
gdmf.apple.com
during the system upgrade? Is it really required?Also, I would suggest anyone upgrading to create a new system volume, clone the current to it using carbon copy cloner (or similar), rebooting to the cloned system and upgrading from it. In case it fails, you can go back to the original one, destroy and create a new test system, and then try again.