Why Rainbow Has Trouble Installing on My Android Mobile? [EN]

If you are unable to install Rainbow on your Android mobile despite the matching of your version with the listed prerequisites, please check whether your mobile camera has an autofocus or not. 
The autofocus is part of the prerequisites for installing Rainbow on your mobile because of the video communications provided by Rainbow. 

Find below the list of the supported Android versions:  

• Google Android OS 4.1 to 4.3 (Jelly Bean)
• Google Android OS 4.4 (KitKat)
• Google Android OS 5.0 and 5.1 (Lollipop)
• Google Android OS 6.0 (Marshmallow)
• Google Android OS 7.0 and 7.1 (Nougat)