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When the macbook updates the system, the updated digital signature will be lost.
Does the subject want to ask, "Why is the updated digital signature lost when the macbook updates the system?" The reasons are as follows: the installation package is damaged, the system time setting is incorrect, and the network problem.

1. installation package is damaged: the installation package is damaged due to an error during downloading or transmission. At this point you need to download the installation package again.

2. System time setting error: If the system time setting is incorrect, the verification will fail, resulting in problems. At this time, it is necessary to set the system time correctly.

3. Network problem: the network connection is unstable or blocked by firewall, which will lead to the failure of verification. You can try to change the network environment or turn off the firewall.