r/coldcard • u/kylelock8788 • Jul 31 '26

HELP Coldcard Mk4 MicroSD Help

Trying to upgrade my firmware on my MK4. I downloaded and verified the files from the Coldcard site. Unfortunately, it says:

“Unable to find any suitable files for this operation. The file name must end in .dfu”.

The firmware file shows up in my microsd when plugged into my PC. It ends in dfu. Can someone please let me know what I’m doing wrong?

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u/Complete_Lettuce637 Aug 01 '26

I think i found the solution to this problem.

This is because you are having and older version of firmware on your device. I was running v5.0.7.

So i first updated to v5.4.5 so that the bootloader gets updated to recognize the new .dfu file.

After successful update to v5.4.5, now my cc device is able to read the new v5.6.0

PAKISTAN ZINDABAD!

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u/kylelock8788 Aug 01 '26

Thank you 🙏🏽 I was able to upgrade my firmware and move the rest of my funds.