Some advanced users attempt to modify the ATMEGA162’s fuse bits to enable "self-programming" or to dump the existing flash for analysis. This is a fringe, research-oriented activity.
A USBasp, USB ISP, or an Arduino (using ArduinoISP). Wiring: 6-pin ISP cable or jumper wires.
Load the ( .eep extension) into the EEPROM buffer.
Ross-Tech uses proprietary, encrypted firmware for the 162. You cannot simply download a hex file from their website. A reflash typically requires:
Locate the Fuse configuration boxes at the bottom or side of the screen (layout varies by version). Enter the standard values for a VCDS ATmega162 setup: 0xCD High Fuse: 0x19 Extended Fuse: 0xFF
To flash the ATmega162 microcontroller, you must establish an In-Circuit Serial Programming (ICSP) link. Locate the six pads or pins on your VCDS PCB (Printed Circuit Board). They are typically aligned near the ATmega162 chip.
Open the interface casing. Locate the ISP header pins (VCC, GND, MOSI, MISO, SCK, RESET) on the PCB. You may need to solder wires directly to these points if a header is not present.
A SOIC or DIP clip that allows you to attach directly to the chip without soldering, though many clones require direct soldering to the board's ISP header.
An USBAsp , TL866II Plus (Minipro) , or AVRISP mkII programmer. The USBAsp is the most cost-effective and popular option for this project.
This is the most straightforward method for cables that have their bootloader enabled.
Ensure the VCDS cable is completely disconnected from both the car's OBD-II port and your computer's USB port. Solder pin headers onto the VCDS PCB if empty pads exist.
After reprogramming the FTDI, repeat the VCDS loader test. The cable should now be fully functional.
To connect the programmer directly to the programming pads or pins on the cable's printed circuit board (PCB).
Ross-Tech invests significant effort in developing and securing their firmware. The ATmega162's lock bits and cryptographic handshakes are designed to prevent:
Firmware files are typically shared in automotive forums like or Digital Kaos . Ensure you are downloading a version compatible with your specific "Loader" (e.g., Kolimer's Loader or VIIPlusLoader).