-2003F error while resetting macOS

Your Mac can not find a macOS and is trying to boot to Internet Recovery— and can not connect to the server.

Some reason your macOS has been compromised, you can re-install from Recovery, bootable USBinstaller, or from a backup.

You may need a better internet connection to proceed otherwise.

Verify your Disk‚ Boot into Recovery (Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD. If errors are found and repaired, run again until no errors reported.

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250

Hey Wdwmmdd,

Thanks for using Apple Support Communities! I understand you're seeing an error when trying to reinstall macOS. I definitely understand how important it is to get this resolved, and I'm happy to help.

If possible, I recommend trying the reinstall again, using a different Wi-Fi. This is especially a helpful step if the Wi-Fi you used is a work, school, or public connection when trying to reinstall. Also, just to make sure you're following the steps for reinstalling I wanted to share the following resource with you: Reinstall macOS

Thanks again, and have a great day!