Issue installing macOS Sonoma on 2011 21.5" iMac

Hi. I'm installing Sonoma on my 2011 iMac (previously running High Sierra) using opencore legacy patcher and a bootable flash drive. The iMac has rebooted several times and selected the "install Sonoma" option from the boot menu each time, before eventually cycling through the installation process. Now I'm stuck on a black screen with the apple logo and a progress bar which has not moved in over an hour. Should I leave it overnight and hope that it progresses on its own? Well aware that this is intensive unsupported software on an older iMac so not expecting it to be instant, just wary that the install won't complete. Any advice/help greatly appreciated. Have I been doing something wrong? Thank you :)

submitted by /u/PerformanceWorth3785
[link] [comments]