A signed UEFI capsule used by ASUS update tools. It carries a header in front of the actual BIOS image.

What is a .cap file?

A .cap cannot be written straight to the chip: the capsule header (2048 bytes on most ASUS boards) must be removed first, which UEFITool does with "Extract body".

How to open a .cap file

  • ASUS EZ Flash / USB BIOS Flashback
  • UEFITool

Recommended software

Related formats