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My mother in law tried to reset and update her MacBook Air. It wont install High Sierra. the internet is connected and ive reset the time to the current UTC. Disk utility won’t let me do anything. Please help.
[Re-Titled by Moderator]
Apple's Recovery servers have been flaky. Reboot the router. Try to disconnect ethernet and use only Wi-Fi (or vice versa). Or download High Sierra and make a bootable installer. Not enough input for a more detailed answer.
How to download and install macOS - Apple Support
Create a bootable installer for macOS - Apple Support
If all else has failed...
Use http:// instead of https://
https://www.youtube.com/watch?v=ouNQS36dIBw&t=95s
The formula for caos: APFS+macOS High+EFI… - Apple Community
How to recover a Deleted Hard Drive durin… - Apple Community
Apparently, Apple is no longer offering some older operating system downloads, including High Sierra. See if you can obtain a copy of the High Sierra installer on the internet. Then, be sure to save it for future reuse if needed.
I am unable to reinstall macOS High Sierra as recovery server could not be connected
