Deleted everything on my macbook pro
I cant reinstall a new copy of mac os, everytime it keeps saying untrusted cert title...help! What can I do?
iMac Pro
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Are you booted into the Recovery Partition when you are seeing this error message? Have you erased/reformatted the hard drive?
Have you tried restarting/resetting the router?
Try booting into Internet Recovery (command - option/alt - R on a restart). It is a slow process. This will install the newest OS that the computer is compatible with. Reformat the drive using Disk Utility/Erase Mac OS Extended (Journaled), then click the Option button and select GUID. Quit Disk Utility. Then install the OS. When the computer restarts, you can use Setup Assistant to restore your data from Time Machine.