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Resolving UEFI Boot Error on Dynobook Laptop

Brittany 0 Reputation points
2025-08-05T10:22:46.0133333+00:00

A Dynobook laptop is currently unable to boot Windows, displaying an error related to UEFI not being found. An attempt has been made to use a USB drive to reinstall or repair Windows, but the process halts due to the UEFI error.

The only device available to assist is a cellphone, which has Windows To Go downloaded and connected to the USB via an adapter.

Any guidance on how to resolve this boot issue would be greatly appreciated to restore access to the laptop for college classes.

Windows for business | Windows Server | User experience | Accessibility
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  1. Smith Pham 2,510 Reputation points Independent Advisor
    2025-08-07T14:52:40.5833333+00:00

    Dear Team,

    1. Check BIOS/UEFI settings:
      • Power on the laptop, immediately press F2 or DEL (sometimes F12 or ESC) to enter BIOS/UEFI setup.
      • Make sure “Boot Mode” is set to UEFI, not Legacy/CSM.
      • Disable Secure Boot if you are booting from a non-official USB.
      • Save changes and exit.
    2. Check boot order:
      • In BIOS/UEFI, set the USB drive as the first boot device.
      • Save and restart.
    3. Re-create bootable USB if not working:
      • The USB must be created as UEFI-bootable (GPT partition scheme).
      • If you can’t recreate the USB from your phone, ask a friend or use a public PC to re-create the installer with Rufus or Media Creation Tool (choose “UEFI/GPT”).
      • Copy the correct Windows ISO.
    4. If Windows To Go USB is available:
      • Boot the laptop from Windows To Go.
      • If successful, back up your data.
      • Use Windows To Go to download/create a fresh Windows installer.
    5. Repair from Windows installer (when USB boots):

    Best Regards,

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