Hold down the L3 button (press the left thumbstick down) and plug the USB cable into your PC while still holding it.
: Newer updates have been reported to reduce input lag by up to 46% on PC. Connectivity Gamesir T4 Pro Update Firmware
Check the GameSir Tutorial Page for specific firmware executable files (note: while the link refers to newer models, GameSir often hosts legacy tools in their download center). Connect the controller to your PC via the USB-C cable. Run the downloaded .exe firmware tool. Click and wait for the progress bar to reach 100%. Key Troubleshooting Tips Hold down the L3 button (press the left