If an update is available, follow the prompts to install it. Restart your computer after the installation completes. 4. Configure Firewall and Antivirus Settings
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Note: Always back up your data using 3uTools or iTunes before attempting to flash or update your device firmware to prevent data loss. If an update is available, follow the prompts to install it
Understanding why this happens and how to resolve it will help you successfully update or restore your iOS device. Understanding the Root Causes Configure Firewall and Antivirus Settings This public link
The error typically indicates that the software cannot verify the integrity or digital signature of the iOS firmware or setup file you are trying to use . This issue often stems from network instability, outdated software versions, or interference from security programs. Why Validation Fails