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
Hmm… My MCP i5 lets me install Catalina, but anything higher shows greyish SSD and info "This disk is locked". Root user is working normally, but the disk has some way of security in higher versions of macOS.
edit: I will check if I have proper Secure Boot options enabled and let u know if that solved the problem.