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I used a 32 gb card. Camera settings were reset before the upgrade. Card was formatted in my computer's SD slot, then in a canon body. Mode dial was on M - though subsequently, I tried Auto and P. FIR file was put in the root of the SD card. Firmware versions 1.1.4, 1.1.6, 1.1.7 each fail at 65%, displaying the update file error.

Unlike OP I did not try to downgrade the firmware initially.

Unfortunately, EOS utility cannot access my camera because it is in its update / boot loop.

I wanted to bump this as I'm having the exact same problem. I've got a pretty much new (under 1,000 actuations) 6D, and I tried to update from 1.1.3 to 1.1.6 using this exact process. I've tried multiple cards. I've tried multiple firmwares (1.1.3, 1.1.4, 1.1.6, 1.1.7), I've tried formatting the card in a separate canon camera first. It is just stuck in a boot loop.

I have not even tried to install Magic Lantern yet on this particular 6D, though I've installed it previously without issue on many other bodies.

The camera will get to 65% each time it tries to update, and then display the "Update File Error"

Canon reps had no idea how to fix this over the phone and suggested bringing it in to Canon Canada for a $49.99 camera servicing.

Very frustrating, and of course it occured one day before a big shoot.

Does anyone have any other suggestions? Is this a hardware problem?