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Error in iPad sync application. The reason for the error is that the signature is invalid. An unknown error occurred (0×E800800 1).
Error in iPad sync application. The reason for the error is that the signature is invalid. The solution to the unknown error is:

1. Ensure a good network environment. If you use a proxy service, try turning it off.

2. Upgrade iTunes to the latest version.

3. Modify the system host and restore other software tampered with by it.

How to modify the host: The host is located in C: \ Windows \ System32 \ Drivers \ etc.

(Disk C refers to the system disk), which can only be modified with administrator's permission.

First, copy the original hosts file to another location, open it with Notepad program, remove everything without "#" at the beginning, save it and copy it back to the original location. When prompted to overwrite, click OK, which may require UAC confirmation. If you encounter problems that cannot be saved, you can try [Right-click-Properties-Security-Edit-Select Account to View Full Control] on the host in the etc directory.