iMac 2009 27 inch stuck on Sonoma install

Hi guys. I have a 27 inch 2009 that gets stuck on the sonoma install.

I follow the process, everything goes well up until the end, almost. The Mac restarts itself 3-4 times and I believe in the final restart, before I get to choose a language and region, the progress bar gets stuck on 5% or so. I waited 1-2 hours but no progress.

How can I get past this? There is no OS to safe boot into.

submitted by /u/Tzar-
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