When trying to flash BIOS, it says not a proper BIOS

[MrAnonymous7122]

System

• Motherboard: H110M-R
• BIOS Version: 4210 I think (it's the latest version)
• GPU: Sapphire RX 580 4GB
• [Y] CSM is turned off. Make sure to confirm this in the BIOS and not with GPU-Z or similar since it can be inaccurate
• [N] 4G decoding is enabled. Make sure to confirm this in the BIOS and not with GPU-Z or similar since it can be inaccurate
• [Y] UEFIPatch is applied (see Using UEFIPatch for more information). On some motherboards DSDT Patching is also needed
• [Y] I have read Common issues (and fixes)

Description

Describe the issue here.
I followed the instructions to add the ffs module and patch it and end up with a BIOS image.
My BIOS did not accept .patched as a file format for image(it only accepts .cap)
I did patch first and then add ffs but it says this image is not a proper image.
Previously when using UEFITool, it produced a .rom file which my BIOS did not accept.
To make it a .cap file, I set the name to etc.CAP when saving it after adding module.
There may be something simple I am missing but any help is appreciated.

[histfuture]

same question

[gervisc]

see [https://winraid.level1techs.com/t/guide-how-to-flash-a-modded-ami-uefi-bios/30627]
in case of asus I used usb flashback and https://biosrenamer.stouder.io/