Phase SAFE_OS

Windows 11 Upgrade, Windows Client

Windows 11 upgrade error: 0xC1900101 – 0x20017 — the installation failed during the SAFE_OS phase

Don’t let it send you down the wrong path! If you dump the setuperr.log or other upgrade logs into ChatGPT, for example, or even straight into Google, you’ll usually be sent off on a long,…

0x20017 0xC1900101 Phase SAFE_OS SAFE_OS Windows 10 Windows 11 Windows Upgrade
9. July 2026

Windows 11 Upgrade, Windows Client

Windows 11 upgrade aborted with error 0x8007000D – 0x2000C (during the SAFE_OS phase, while APPLY_IMAGE was running)

A common cause is that the EFI partition is too small for the upgrade process. Most EFI partitions are normally 100 MB or 260 MB in size. I recommend increasing it to 300 MB or…

0x2000C 0x8007000D APPLY_IMAGE Phase SAFE_OS SAFE_OS Windows 10 Windows 11 Windows Upgrade
2. July 2026