How do i change region playback support in Egreat S900
OS1:
press mute button 4times+press 1 ==>regionA
press mute button 4times+press 2 ==>regionB
press mute button 4times+press 3 ==>regionC
press mute button 4times+press 1 ==>regionA
press mute button 4times+press 2 ==>regionB
press mute button 4times+press 3 ==>regionC