Cannot connect to the App Store in MacBook air

emilog11 wrote:

Mac book air 2012 13”

it had installed the Mac OS Big Sur and I cleaned

now Mac ox

but did not run the App Store to make the update

What was the text of the error message you encountered?

Here is how to: Erase and reinstall macOS - Apple Support

Erase the Mac again, and use the following chord when starting up Recovery: Option-Command-R

See if that gets you to macOS 10.15 Catalina or macOS 11 Big Sur, or whatever is current for the particular MacBook Air you have here—a 2012 or 2013 or whatever particular model this is.

Though if you’re retiring or trading in or recycling the the Mac, you’re done.

MacBook Air only runs macOS and not iOS.

Which MacBook Air?

What error message is shown when you try to reinstall macOS?

Here is the usual erase-and-install: Erase and reinstall macOS - Apple Support

Depending on which specific MacBook Air, how to use Recovery can vary.