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windows/deployment/upgrade/troubleshoot-upgrade-errors.md
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If a Windows 10 upgrade is not successful, it can be very helpful to understand *when* an error occurred in the upgrade process.
Briefly, the upgrade process consists of four phases: **Downlevel**, **SafeOS**, **First boot**, and **Second boot**. The computer will reboot once between each phase. Note: Progress is tracked in the registry during the upgrade process using the following key: **HKLM\System\Setup\mosetup\volatile\SetupProgress**. This key is volatile and only present during the upgrade process; it contains a binary value in the range 0-100.
Briefly, the upgrade process consists of four phases that are controlled by [Windows Setup](https://docs.microsoft.com/windows-hardware/manufacture/desktop/windows-setup-technical-reference): **Downlevel**, **SafeOS**, **First boot**, and **Second boot**. The computer will reboot once between each phase. Note: Progress is tracked in the registry during the upgrade process using the following key: **HKLM\System\Setup\mosetup\volatile\SetupProgress**. This key is volatile and only present during the upgrade process; it contains a binary value in the range 0-100.
These phases are explained in greater detail [below](#the-windows-10-upgrade-process). First, let's summarize the actions performed during each phase because this affects the type of errors that can be encountered.