I NEED HELP-My iMac is stuck

Can’t download the Os back on my iMac. It’s an iMac mi-2011, I bought it second hand. It was working well with Big Sur on it. But I did the latest update and it restarted it and I have to reinstall the OS back but it’s not working, even with the original OS. I tried also with an usb didn’t work. I’m desperate.

submitted by /u/ShockAlternative816
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