"The Installer information on the recovery server is damaged" when installing macOS Sierra

macos

Im trying to reinstall macOs Sierra but get

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In the log I only get

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Any help appreciated!


You need to restart the Mac and keep holding ⌘+R, and you will get the Internet Recovery screen. Connect to WiFi or via Ethernet and you will be to reinstall the OS.

A couple things to watch on machines that have been off for a while:

  • check the date and time, if they are not within 4 minutes of reality, the check for valid software can fail.
  • Be very clear if your macOS installer was downloaded a while back, the signing certifications can be expired.
  • Be aware that even an unexpired certificate can fail to install if there are errors in the network or disk.

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