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# What is .cap?
- Since some update, all ASUS BIOS files must be in `.cap` format instead of `.rom` format
- `.cap` format is raw `.rom` format with 2048 bytes header prepended
- The header is likely to be some sort of cryptographic signature and/or checksum
- EZ flash check this header, while BIOS flashback does not

# My case
- Z10PE-D8 WS BIOS, 3407
- Haswell microcode removed
- `me_cleaner` with `-S` option applied
- Original 3407 `.cap` header is prepended into the modded `.rom`, it became the file below
- Rename the file downloaded to `Z10PEWS.CAP` and put it into root of FAT32 USB drive, start BIOS flashback, success for me. https://drop.wtako.net/file/9321f82f97bc7a7b84b1fb0d76d3c3b10cc0a92f.CAP

# .cap to .rom?
`$ dd if=Z10PE-D8-WS-ASUS-3304.CAP of=Z10PE-D8-WS-ASUS-3304.rom bs=1024 skip=2` as mentioned in https://github.com/corna/me_cleaner/issues/71
Just remove the first 2048 bytes.

# .rom to .cap?
Since .cap is signed and EZ flash checks it, it is NOT possible to flash a modded .cap unless you know how is it signed.

But, if your motherboard supports BIOS flashback
1. `$ head -c 2048 Z10PE-D8-WS-ASUS-3407.CAP > modded.cap`
2. `$ echo your-modded.rom >> modded.cap`
3. `$ mv modded.cap MB_CAPNAME.CAP`
4. You can now flash the `.cap` you made. For names and method please refer to https://www.asus.com/support/FAQ/1013998/.

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