How to fix network recovery and FileVault features blocked by clock problem
Sometimes Apple needs your Mac to know exactly what time it is. Most people leave their Macs set to the default setting in which the time is set via a network server that keeps it up to date down to the second. But you may have turned that feature off, reset the clock manually to check something or prevent a date-based expiration, or have a hardware problem that’s causing a glitch. (Some Macs include long-lived battery cells designed to keep the clock ticking and preserve other settings.)
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