Ross-Tech’s legacy HEX-USB and early HEX-NET interfaces (pre-2020 designs) often use the as the main USB-to-K-Line/CAN controller. This 8-bit AVR microcontroller runs custom firmware written by Ross-Tech that handles:

: To connect the programmer to the VCDS PCB. 2. Identifying Connection Points

: Users can reflash their device to change or add support for different languages beyond the original factory setting.