Using the IR remote, press the following button combinations subsequently to control certain parts of your camera.
[*] → [＃] → [1] : OSD menu default English
[*] → [＃] → [4] : 1080P@30fps default hdmi resolution
[*] → [＃] → [5] : From firmware 8.2.29 Disable microphone, setting is persistant even after power cycle
[*] → [＃] → [6] : Factory default
[*] → [＃] → [7] : 1080P@60fps default resolution
[*] → [＃] → [9] : From firmware 8.2.29 Enable microphone, setting is persistant even after power cycle