Error 2006 after reviving imac

Soooo, this morning, possibly after a macOS update, my iMac suddenly shut down about five minutes after I turned it on. I tried restarting it, but every time it powered on, it would shut down again after about 10 seconds.

I connected it to my MacBook and tried to restore the iMac using DFU mode, but I wasn't able to complete the process because I kept getting the same error every time.

What should I do, what's wrong with it?

It is funny because it kept shutting down after reviving, but there was one time when everything went more or less fine, and after downloading startup options I saw Settings, MacintoshOS and turn off button

The System cannot be restored on this device. Failed to restore device in recovery mode, libusbrestore error:2006