I have a 2013 MacBook Air that used to run Windows, but it’s really slow now. I’d like to reinstall macOS.
I’ve tried almost every local reinstall method(cmd+R, alt+cmd+R,shift+alt+cmd+R), but it always gets stuck on the 5101F Internet Recovery error or 'The installer information on the recovery server is damaged'. I’m thinking of taking it to a computer repair shop in Sydney — does anyone know roughly how much it might cost to fix or reinstall macOS? I’d like to know if it’s worth repairing.
Make a bootable version of Big Sur on a USB drive https://support.apple.com/en-au/101578
Perhaps this link if you don't have another Mac handy https://mrmacintosh.com/macos-big-sur-full-installer-databas…