5DMkII 1.07 firmware.
Firmware Update Version 1.0.7 improves and mitigates the following two types
of image quality phenomena that occur under certain shooting conditions.
1. "Black dot" phenomenon (the right side of point light sources
2. Vertical banding noise
Firmware Version 1.0.7 is for EOS 5D Mark II cameras with firmware up
to version 1.0.6. If the camera's firmware is already version 1.0.7,
it is not necessary to update the firmware.
Example of fix.