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 Shown Material:PC+Aluminum Alloy Note: The controllers are all original firmware, original program, and the APP functions are normal. MAX G2 Controller 40km/h This 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 use Package Contents: 1 * Controller Only 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.