Search for string entries like Failure Bucket or Faulting Driver to spot the explicit .sys file stopping the boot sequence.
The system reverts changes and displays the following message: The installation failed in the SAFE_OS phase with an error during BOOT operation . 0xc1900101 0x20017
For the uninitiated, this error code looks like hexadecimal gibberish. However, for system administrators and power users, it tells a very specific, maddening story. It is the code of "The Safe OS," and it usually means your computer is trying to protect itself from its own software. Search for string entries like Failure Bucket or
"The installation failed in the SAFE_OS phase with an error during BOOT operation." This error usually indicates that an incompatible driver, hardware configuration, or security software is preventing Windows from migrating to the new operating system version. It is often seen when upgrading from Windows 10 to Windows 11 or between major feature updates like 24H2. Core Causes 11 sites Upgrade Fails and Generates Error Code 0xC1900101-0x20017 Feb 12, 2026 — However, for system administrators and power users, it
Ensure you maintain on your target operating system partition. Open an Administrative Command Prompt . Execute the deployment imaging repair asset: DISM.exe /Online /Cleanup-image /Restorehealth Use code with caution. Execute the system file integrity verification engine: sfc /scannow Use code with caution.
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