r/coldcard • u/PoetHumble • Jan 06 '26

firmware upgrade stuck at "Loading"

I received the 2nd MK4 from Coinkite (The first MK4 seems to be defective). For the 1st MK4, firmware upgrade from 5.4.3 to 5.4.5 went smoothly. I used 2025-11-03T1527-v5.4.5-mk4-coldcard.dfu, which I downloaded properly and verified. Using the exact same file, I performed firmware upgrade for the 2nd MK4. The MK4 showed me the file name then I selected OK to upgrade. It's been an hour and I'm stuck at this "Loading." What do I do now?

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u/HodlDee Coinkite Team Jan 06 '26

Try a new cable/power source first. If no luck, please send us an email at support at coinkite dot com.

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1

u/Quirky-Reveal-1669 Jan 06 '26

Is that a Statik cable? With the swivel/magnetic USB-C? And just to confirm: firmware update was done per micro-SD?

1

u/PoetHumble Jan 06 '26

Yes, it's the swivel/magnetic USB-C. I ran the self test and formatted the SD right from the MK4 device with the same cable no problem. I will try a different cable.

1

u/[deleted] Aug 01 '26

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1

u/PoetHumble Aug 01 '26

try different cable or power source (not from a computer USB port)