Computer eligibility
I am resetting my old Mac and I cannot connect to get computer eligibility to re-download the macOS Sierra how do I move forward.
Current Pro Desktops
Question marked as
Have you actually wiped your mac and are now trying to install Sierra
from Apples Recovery Servers.
If so why do you people do that, why do you not have a copy of the macOS Sierra
installer before wiping your mac and relying on Apples Recovery Servers.
Try this,
The certificates for several of Apples OS's expired in October 2019, Apple have been very poor at getting these updated on their Recovery Servers with valid certificates. This may be the problem you are experiencing.
Try this workaround, we are going to set the time and date on your mac to a date previous to the expiry date of the certificates.
Connect your mac to your router via cable, not WiFi
Boot to your Recovery HD, click on Utilities in the menubar select Terminal.
Make sure WiFi is switched off, it can reset the date back to today.
Enter a new date, for example or just copy and paste
sudo date -u 011421002015
press Return
enter your password
press Return
If Terminal returns an error saying sudo : command not found, then try again without sudo.
Now try downloading the OS.
If this works then when the OS is installed and booted up you can Open System Preferences> Date & Time
and reset the time back to today.