Torso Electronics S-4

Download the latest S4 OS update file. Connect the S4 to the computer via a USB-C or USB-C to USB-A cable. Enter USB MASS STORAGE mode on the S4. Drag and drop the update file to the S4's root folder. Use the computer's eject function to disconnect the S4. Tap [CONFIG], go to the SYSTEM menu. Select INSTALL UPDATE to install the update. Do not unzip the update file before transferring it to the S-4.