2017/04/08   V1.9.1
1.Improve the compatibility with 5D MARK IV. 
2.Correct the over-expose problem when using wireless radio master ETTL mode on 5D MARK IV. 
3. Other improvement

V1.9.0
Improve the compatibility of wireless shooting system. 


V1.8.9
Optimization of focal length adjustment. 


V1.8.8:
Fixed:The exposure compensation icon display abnormal.


V1.8.7
Improve wiresless flash shooting compatibility


V1.8.6
Fixed:Sometimes turning off the YN600EX-RT,the speedlite can not save the setting.


V1.8.5:
Fixed:When using the YN600EX-RT and Canon 430EX III together,wireless shooting does not work.


V1.8.4
Fixed: when the restoration used on 60D camera,the camera displayserr 20due to not in fully charged;
Optimize the stability of focal length display.


V1.8.3:
Repair the focal length error problem when using with the telephoto lens. 


V1.8.2:
Fixed: the compatible problem of some old models;
Fixed: the out-of-control problem of focal length when used with the YN622;
Fixed: the abnormal display problem caused by low battery;
Optimize the accuracy of the battery display;
Optimize the overheating protection function.


Version 1.8.1:
Fixed: when using the flash with a camera released up to 2011,"!TV" warning icon  always appear on the screen of the flash ;
Fixed: power recycling failure and overheat warning error when this speed-lite is off in dormant state and turned on immediately;
Fixed: invalid flash ratio settings when this speed-lite is used as wireless master unit.
Fixed: triggering failure when the built-in flash in the camera is set as wireless master unit and takes part in exposure;
Fixed: update failure on 64bit Windows XP/7;
Improved: "buzz" from the flash head when this speed-lite is in stand-by state.
Added: contrast control custom option (C.Fn 28);
Improved: inaccurate battery status;
Modified: version number display mode.

