(Totally Four Steps)
Step 1: please download the compression package for SKU switch controller on your pc with this link, then unzip the upgrade file.
B55 Switch Controller Upgrade Firmware
Step 2: Click the firmware, open it, display the following interface.
Step 3: Plug USB cable we offer with the controller into windows pc USB 3.0 interface(the usb cable must have date transfer function), then vertically press the left joystick, don’t loosen your hands, plug the other interface of USB cable into controller, the ‘Update Firmware’ button will be activated.
Step 4: Release the left joystick and click ‘Update Firmware’ on your computer. The upgrade will be completed within 2 seconds.