Erased Mac using Find My
Once I erased my Mac, I found it and I have it with me. How can I have it factory reset it so that I can use it again?
MacBook Pro 15″, macOS 11.5
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Thanks for those details!
It looks like your Mac is asking for the system lock PIN that you set when you erased it using Find My. If you don't have this PIN, unfortunately you will need Apple's assistance to unlock the Mac. Please contact Apple Support and set up a hardware appointment. (Apple does have a backdoor for this system, so no actual repairs are necessary, but they need physical access to the Mac.)
When this lock screen in particular is displayed, it isn't possible to erase the Mac and reinstall macOS without the PIN. This is because the Mac is locked into booting macOS Recovery, and once in there, it displays the lock screen. Once the Mac is unlocked, it will let you use macOS Recovery as normal to reinstall macOS.