I have tried to update the M600 Pro firmware to .00.01.67, however every attempt gets to 99% and then I get an update fail message (see attached)... any ideas what is ging wrong???

Hi, did you ever get this resolved as I am struggling with the same issue?

I had the same problem while updating to the same version. has yours been solved? The firmware update process requested to remove propellers, which was strange to me and I only keep them in bags. it can't be easily removed. hope this is not the cause.