I messed up with my imac 21" late 2013
I tried to install Ubuntu but I unfortunately erased the partition of macos, maybe not only that one.
I have a time machine backup but here is the problem
I restart with command +R and I make a new installation and it comes with maverick 10.9.5 with NO possibility to update
And it can't also connect to the NAS servere where the time machine backup is.
What can I do?
iMac 21.5″, macOS 10.15
Start up from macOS Recovery
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
In Disk Utility>View, select Show all Devices, highlight the top left entry.
APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.
If all else fails...
Use http:// instead of https://
https://www.youtube.com/watch?v=ouNQS36dIBw&t=95s
The formula for caos: APFS+macOS High+EFI… - Apple Community
MacOS High Sierra Problem - Apple Community
Sysyem disk partition
