0xC1900101
Hex 0xC1900101 · Decimal -1047527167 · Type NTSTATUS
Windows setup rolled back the upgrade, usually due to a driver error.
Also searched as: 0xc1900101, 0xC1900101, 0xc1900101 - 0x20017, 0xc1900101 - 0x30018, 0xc1900101 - 0x4000d, windows 11 upgrade error 0xc1900101
What it means
0xC1900101 errors (often shown with a second code like 0x20017 or 0x30018) appear when a Windows feature update or upgrade fails and rolls back to the previous version. They almost always point to a driver or hardware compatibility problem during the upgrade phases.
Applies to: Windows 10, Windows 11
How to fix 0xC1900101
- Disconnect non-essential USB devices, docks, external drives and extra monitors before upgrading
- Update drivers, especially storage, graphics, network and chipset, from the PC or component manufacturer
- Uninstall third-party antivirus temporarily (reinstall right after the upgrade) and keep Microsoft Defender active
- Make sure at least 20 GB is free on C:
- Run DISM /Online /Cleanup-Image /RestoreHealth and sfc /scannow before retrying
- Update the BIOS/UEFI firmware from the manufacturer's site, following their instructions carefully
- Check setup logs in C:\$WINDOWS.~BT\Sources\Panther (setuperr.log) to find the failing driver
- Try the upgrade with the Installation Assistant or a USB made with the Media Creation Tool
Why it happens
During the upgrade, an incompatible or outdated driver fails to load, causing setup to roll back. Security software, low disk space and old firmware are additional triggers.
FAQ
Do I lose files when 0xc1900101 rolls back?
No. Windows returns to the previous version with files intact.
What does 0xc1900101 - 0x20017 mean?
The failure happened in the SAFE_OS phase, usually due to a driver.
Related errors
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