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£º
Improve wiresless flash shooting compatibility


V1.8.6£º
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 displays¡°err 20¡±due 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.