1. How to Troubleshoot Windows 10 Upgrade Errors?

2.  This phase runs on the source OS, due to which upgrade does not usually appear. If you encounter an error, make sure that the source OS is stable. Also, make sure that the Windows setup source and the destination drive are available. Down level phase:

3. Errors most commonly occur during this phase due to hardware issues, firmware issues, or non-Microsoft disk encryption software. Since the computer is booted into Windows PE during the Safe OS phase, a useful troubleshooting technique is to boot into Windows PE using installation media. Safe OS phase:

4.  Boot failures in this phase are relatively rare, and almost exclusively caused by device drivers. Disconnect all peripheral devices except for the mouse, keyboard, and display. Obtain and install updated device drivers, then retry the upgrade. First boot phase:

5. Here the system is running under the targeted OS with new drivers. Failure of the boot process is the most common error appears due to anti-virus software or filter drivers. You need to disconnect all peripheral devices except for the mouse, keyboard, and display Second boot phase:

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