It's a 2017 iMac 5K. Full details in the first post of this thread.

I live in Washington, D.C.

@softraid-support I didn't migrate any data. The previous instructions (earlier in this thread) were the following: you may need to reset Ma...

Took me a while to do this but just followed your directions. Did the restart in recovery mode and reinstalled MacOS. Then, started up and tried ...

@softraid-support I get a command not found message