EFI lost info after SMC reset

Hi. I had a system freeze in my iMac, running Monterey with OpenCore Legacy Patcher, and did an SMC reset. Now this led to the computer starting again, but the EFI seems to have lost all info about an OS.

I ran my macOS Monterey on an external SSD and have cleaned the old internal HDD from all info, and now use it as an archive disk with exFAT.

Now my main issue seems to be that I can't get to the boot menu and therefore can't use a USB stick to restore the system. Any ideas anyone?

submitted by /u/bidutree
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