el capitan update frozen?

Mac is Stuck on Apple Logo or Progress Bar. Try This!

Immediately after you hear the startup sound, press and hold the Command + Option + P + R keys. Keep holding them down until you hear the start up sound again. Release the keys, and the NVRAM will have reset. The update should resume.

Big Sur Upgrade = Boot Progress Bar Stuck Mid Install! Black Screen with Apple Logo and progress bar

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