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Unable to install mac OS. I am stuck up. What will i do?

MacBook Pro 13", OS X 10.11

Posted on May 10, 2020 4:07 PM

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6 replies

May 11, 2020 12:33 AM in response to Zalex138

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 011421002016


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.

Unable to install mac OS. I am stuck up. What will i do?

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