Here's how I resolved this issue when updating firmware on Windows 10. First make sure camera update utility v6.2 is installed. Connect the camera and turn it on. Try to upgrade and wait for "failed" message.
Go to device manager, find
"Blackmagic Pocket Cinema Camera 4K" device which will have yellow exclamation mark on it.
Right-click on it and choose
"Update Driver" and then choose
"Browse my computer for driver software"Now choose
"Let me pick from a list of available drivers on my computer"Click
"Have Disk" button and navigate to this file via browse option -
"C:\Program Files (x86)\Blackmagic Design\Blackmagic Camera Setup\DriverUSB\Cameras\CinemaCamera.inf"
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Click
"Open" then
"OK" and you'll be presented with list of devices where you'll choose
"Blackmagic Pocket Cinema Camera 4K" and hit
Next
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You'll be presented with a
"Update Driver Warning" window here to which you say
Yes and complete driver update.
If you followed the steps correctly the yellow exclamation mark should be gone from camera entry in device manager.
Now you can run the firmware update without any issues.
Tested a few times on two machines, worked like a charm.