The KESS V2 SD card contains the device's firmware and communication protocols. When these files become corrupted—often indicated by "Wake up" or "Protocol not found" errors—the tool may require a manual file restore or a completely new SD card. SD Card Restoration Guide
Bootloader Initialization: The hardware looks for specific boot sectors upon power-up to initialize the LCD screen and USB communication.
Protocol Storage: The files contain the algorithms required to communicate with specific ECUs (e.g., Bosch, Siemens, Denso). As new vehicles are released, these protocols are updated.
Driver Database: Drivers for interfacing with the hardware on host PCs (Windows-based) may be stored or referenced.