I have a 2010 Mac Pro running Open core Monterey and I’ve been trying to upgrade it to OC Sonoma. I’ve already successfully done that exact same upgrade on a 2009 Mac Pro (thanks to guidance on this forum) but it just won’t have it on this machine for some reason. I power up, hold down the option key and… nothing… it never comes back and I have to do a hard reset. The same USB installer seems fine on the other machine (although I didn’t proceed with the install of course). The only difference I can see (apart from the year) is the graphics card on 2010 model (which is an RX580). Anyone got any ideas? I’m a bit stuck.
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