Inconsistent signatures may lead to the loss and damage of downloaded installation package data, unstable connection between the currently used network and the upgrade server, packet loss when downloading the system update package, and the verification of the update package failed.

It may be due to too many p 12 installations generated by certificates. Installing too many p 12 certificates will also attract Apple's attention, resulting in the certificate being blocked. Too many times of certificate generation and revocation, multi-generation enterprise certificates and repeated revocation will also trigger Apple's security mechanism and block the enterprise account. The other one is being reported.