Make sure WiFi is switched off, it can reset the date back to today.Įnter a new date, for example or just copy and paste 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.Ĭonnect your mac to your router via cable, not WiFiīoot to your Recovery HD, click on Utilities in the menubar select Terminal. This often results in the error 'no packages were available for download'. Their Recovery Servers with valid certificates. The certificates for several of Apples OS's expired in October 2019, Apple haven’t bothered getting these updated on If you want to try and reinstall macOS Sierra from Apples Recovery Servers read below. (Do not highlight any of the indented Volumes) Highlight the Disk in the left hand panel, the Disk will be called Apple SSD. Restart your mac to your Recovery HD, select Disk Utility and press Continue.Ĭlick View in the menubar and select Show All Devices. Were you trying to do an Erase and Reinstall from your Recovery HD and the Apple Recovery Servers. macOS Sierra can only run on Disks formatted as Mac OS Extended (Journaled). If the mac had been running High Sierra, Mojave, Catalina, Big Sur or Monterey then the Disk would have been formattedĪs APFS. Which OS was on the mac before you tried to install macOS Sierra.
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