Dell XPS 15 9550 Laptop

Fix for firmware upgrade on Dell XPS 15

Firmware update from 01.00.07 to 1.2.0 is not permitted. The system is configured to block firmware updates to previous revisions

Sound familiar? I couldn’t install any Dell firmware updates for my XPS 15 due to a rogue prefix ‘0’ in the default factory firmware version ‘01.00.07’ causing the Dell BIOS update tool to think it’s downgrading itself. 😐

Here’s how to fix it.

  1. Restart your computer
  2. From the DELL logo press the ESC key until the BIOS Settings prompt shows
  3. Open the Maintenance > Firmware Downgrade tab
  4. Remove the check on Do not allow firmware downgrade
  5. Click Apply and then exit BIOS
  6. Run the firmware upgrade

That’s it!

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