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ios source reading revision number is invalid

1. Check whether the revision number is correct: Please make sure that the revision number entered is accurate and there are no spelling errors or other errors. You can try to re-enter the revision number and verify again.

2. Check the network connection: Please ensure that the device is connected to the Internet and the network connection is stable. Sometimes, network connection issues cause the revision number to be invalid.

3. Update the iOS system: If the iOS system is not updated to the latest version, the revision number will be invalid. Please try to update the iOS system and verify the revision number again.