Windows 11 error: The installation failed in the SAFE_OS phase with an error during BOOT operation

The error "The installation failed in the SAFE_OS phase with an error during BOOT operation" during a Windows 11 upgrade indicates that the installation encountered a critical issue during a crucial phase of the setup process.  Since the error occurs during the SAFE_OS phase, which prepares the system for finalization, it might lead to boot problems or system crashes if not properly resolved.

If the installation fails and the system needs to be rolled back or restored, there is a potential risk of data loss, especially if backups are not current. Repeated failed attempts to upgrade without proper fixes might cause corruption of system files or the existing Windows installation. Resolving this error often involves multiple troubleshooting steps, leading to increased system downtime and maintenance efforts.