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| p.2 #8 · p.2 #8 · Canon EF 40mm f/2.8 STM Lens Firmware v1.2.0 update! |
I got the error the first time (as described above). The second time worked fine. Here was my exact procedure.
The first time, I had the camera power on, removed the CF card, wrote it (and flushed it) on the PC, put it back in the camera, and updated firmware.
After this, the camera was locked up at 2978% or something so I yanked the battery. When I powered it back on, I got a message that the lens update had failed and that I should try to update it again. I removed the lens, power on just to make sure the camera is still okay, power off, put the lens back on.
Then update again and it works.
So probably, just have the camera power off, CF card in (with the lens firmware on it), the lens mounted, and then turn the camera power on and update first thing. Also, I had a formatted SD card in the whole time that I didn't touch. Hope that helps.