For users who are still experiencing issues after basic troubleshooting:

If you have reformatted the SD card, reinstalled KSuite, and checked your cables but still see the error, your (the "brain" of the Kess V2) may be locked or damaged. At this stage, the device might need to be reflashed with a J-Link programmer, or the chip might need replacement.

, it usually means your device is "out of tokens" or the protocol hasn't been "unlocked" for your specific serial number. Always run K-Suite as an Administrator and ensure your isn't deleting the

: The Kess V2 community and Alientech support channels can be invaluable resources. Look for similar issues that have been resolved and follow any advice or patches provided.

| Cause | Explanation | |-------|-------------| | | Many cheap KESS v2 units from eBay/Aliexpress have incomplete or mismatched firmware. The protocol database may be missing or corrupted. | | Incorrect vehicle selection | Choosing the wrong model, year, or ECU type confuses the protocol detection. | | Wiring / OBD connection issue | Loose pins, poor soldering inside the KESS cable, or a faulty OBD2 adapter (e.g., missing CAN lines). | | Power supply problem | Insufficient voltage (especially during writing) can cause protocol handshake failure. Use a battery charger (13.5V–14.5V). | | Corrupted SD card / firmware | Clone units often rely on an SD card containing protocols. If the card is corrupted or files are missing, protocols won’t load. | | ECU locked or non-standard protocol | Some ECUs (e.g., Bosch MED17, Siemens SIM2K) require boot mode or bench connection; OBD protocol may be disabled by the manufacturer. |

: Check for "cold" or loose solder joints on the main NXP chip. Reflowing these pins with a fine-tip iron often restores protocol recognition. Change the USB Cable