Factory Reset Gone Wrong - support.apple.com/mac/startup
Someone previously asked about having a folder pop-up or other unexpected failure - having tried Command + R without succesfully installing. The conversation was older so I needed to "ask a question" as I could not reply.
I bought a MacBook Air in Dec 2019 and didn't actually open the box until 18 months later (yeah, insane).
In any case, I could not get it to execute a reboot after the usual set-up (language, etc.) - I think because the OS was several versions ago. No matter what I did, no Command +R function (with power, after power, before chime, after chime) worked. I found an answer with Command+Option+Shift+R (internet recovery mode) which did work to the point that the globe appeared. However, that WiFi attempt also gave an error - the globe had a yield sign. Underneath was web address for the issue. I thought I would list that since I did not find it on my own:
support.apple.com/mac/startup
This showed several different errors that people may run into and what they can try to do about it.
Best of luck.