Lenovo Uefi System Firmware 9ycn39ww Error Code 10 Verified (Top-Rated | MANUAL)

After resetting, boot into Windows. The UEFI device will be re-initialized.

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Why does Windows suddenly stop talking to your motherboard’s firmware? Several scenarios trigger this: Lenovo Uefi System Firmware 9ycn39ww Error Code 10

Lenovo UEFI System Firmware 9YCN39WW Error Code 10 indicates that Windows has encountered a problem starting the firmware driver, often because an update was interrupted or blocked by system security protocols. This error commonly appears in the Windows Device Manager with a yellow exclamation mark. Primary Causes Unsatisfied Power Requirements:

If the error persists after all steps:

Last updated: October 2025. Applies to Windows 10 and Windows 11 on Lenovo Legion, IdeaPad, ThinkPad, and Yoga series.

Try these methods in order. You do not need to replace your motherboard; this is almost always a software or driver issue. After resetting, boot into Windows

This is the most effective fix. Windows often hides this driver, but we can force it to reinstall.