I just erased a Mac 3.5 GHz Quad-Core Intel Core i5, preparing it for sale, 2017 model. I followed the instructions to erase the system and now trying to resintall the OS, which is defaulting to High Sierra. I read the 2017 feed and the date is current on the machine but entering disk utility, I keep getting the error message. Any assistance would be greatly appreciated.
iMac Pro (2017)
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.
What has often worked for others is to use this Restore Method instead of CMD+r keys...
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
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The recovery server could not be contacted
