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Canon 77D is being stuck on 99% during firmware upgrade

avini84
Contributor

Hi,

I have tried to update the firmware of the Canon 77D dlsr, from ver 1.0.2 to 1.1.0.

The first time I did it - it was stuck in the 99th percentage of the process.

The only option available to see in the camera (after removing and installing back the battery) is the Firmware Update program.

I then used other cards, formating the cards both using other similar Canon DSLR (not the exact model - Rebel T5i) and trying to both update to 1.1.0 or 1.0.3, each time the result is the same (I have once managed to get to 100% but it was stuck there..)

Any help will be appreciated!!

-- Nissim

13 REPLIES 13

Did you now formatted the card again and put the right canon version again? Are you sure that now you are using the right canon firmware and a right sd card type?

when i dump it will be files like rom and rom1 md5 after that i need just to delete the dumper.fir and put the update fir after that i just put the sd card back to camera and update ?

Yes, delete all the files except of the update fir and try to do the upgrade again. Now it should work given that you see 0.0.0 -> 1.0.3

i will try again by

format the card then put the fir dumper

insert to camera the run it after that format the card and put for first time the update fir thats it?

okay it shows 0.0.0 to 1.0.3 but it stucks at 99%
i think it needs new board 😓

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