1. your APP is the latest version before connecting it. If not, please update its version.2. When connecting the APP, please select the serial number starting from 01GXA...3. Find "More Functions" , Click on"Custom Settings of Sport Mode",then choose "Sport Mode".4. Click "Yes" and then increase the maximum speed to 40km/h.5. Click "Acceloration Settings", choose "N20 Acceleration".Colour:As ShownMaterial:PC+Aluminum AlloyNote:The controllers are all original firmware, original program, and the APP functions are normal.MAX G2 Controller 40km/hThis is the official firmware version with unlimited speed, without the need for third- apps.Due to different batches, there may be differences in product appearance and printed text, which not affect usePackage Contents:1 * ControllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.