1.Can these boards work for Raspberry Pi with 4 players together?
2.How to identify the counterfeit product?
-At present, only XM-02 is being counterfeited. However, we have upgraded this model. You can send us a photo of the product for identification. I recommend buying as much as possible in our partners. Click "Contact Us" and look for "Where to buy."
3.How to play games on an android phone?
-First your android phone must support the OTG, otherwise you have to root to support OTG. Second step, download MAME emulator app from your app market. For example I use MAME Arcade-Classic M.A.M.E Emulator.
Third step, open this app and download your favorite games. Fourth step, open a game you want to play and configurate your buttons and joystick. After finished all these, you can play.