ML causing Err20 on 550D
Created originally on Bitbucket by Anonymous
Installed ML with 1.09 firmware, 550D started having Err20 error, with the mirror not returning to the current position.
Pulled the battery for 12 hours, and the mirror return to the current position on power on.
Problem happen again after less than 10 shots.
Flash firmware back to factory 1.09, and problem gone away.