Reflashing a VCDS (HEX-USB+CAN) clone based on the ATmega162 microcontroller is often necessary to unbrick a "de-licensed" cable or to upgrade its firmware for compatibility with newer software versions. 1. Required Components To perform the reflash, you typically need:
Hardware Programmer: An USBasp or an AVR ISP programmer is recommended. Some older guides mention using an LPT port programmer, but these are often unreliable on modern PCs.
Software: Tools like ProgISP, AVRDUDE, or specialized utilities like VAGCOM_EEWriteLang.
Firmware Files: A valid .hex file for the ATmega162 flash and often an accompanying .bin or .eep file for the EEPROM. 2. The Reflashing Process
Physical Connection: Open the cable housing. You will need to connect your programmer to the ISP pins (MISO, MOSI, SCK, RESET, VCC, GND) on the ATmega162 chip. Some clones have these pins broken out; others require soldering.
Unlock the Chip: Many clones come with "lock bits" set. You may need to perform a full chip erase before you can write new firmware.
Flash the Firmware: Use your programmer software to load the ATmega162 flash file.
Update the EEPROM: This is often done via USB using specialized tools like VAGCOM_EEWriteLang.exe to set the correct language and license status.
Configure Loader: Modern clones frequently use a "Loader" (e.g., VCDSLoader) to bypass internet-based license checks that can brick the cable. 3. Avoiding Future Bricking vcds atmega162 reflash
Block Internet: Add 127.0.0.1 update.ross-tech.com to your Windows hosts file (C:\Windows\System32\drivers\etc\hosts) to prevent the software from checking for unauthorized serial numbers.
Use the Loader: Always launch the software through the provided VcdsLoader.exe rather than the original VCDS.exe. 4. Limitations of ATmega162 Cables
While these cables can be updated to "work" with newer software versions (e.g., 20.x or 21.x), the ATmega162 hardware is limited. It generally does not support the full feature set of newer V2 interfaces for vehicles produced after approximately 2019. Upustvo Za FLASh 1212 Vcds | PDF - Scribd
Guide to Reflashing VCDS Interfaces with ATmega162 Reflashing a VCDS (VAG-COM Diagnostic System) interface containing an ATmega162 microcontroller is a common procedure used to "unbrick" a cable that has been disabled by official software or to update it to support newer software versions. ⚠️ Critical Warnings
Hardware Compatibility: This process only works on interfaces using the ATmega162 + FT232 chip combination. It will not work on newer "Real V2" interfaces using ARM chips.
Risk of Bricking: Incorrect wiring or power loss during the flash can permanently disable the interface.
Software Mismatch: Using the wrong loader or firmware for your specific hardware version can lead to immediate blacklisting by the VCDS software. 1. Requirements To perform the reflash, you will need the following tools:
USBASP Programmer: A cheap AVR programmer (like the USBASP on Amazon) or an Arduino used as an ISP. Software: Reflashing a VCDS (HEX-USB+CAN) clone based on the
ProgISP or ExtremeBurner: To write the .hex and .eep files to the ATmega162.
MREPAIR / VCDSLoader: Specialized tools often bundled with "unbrick" kits to manage the bootloader.
10-pin or 6-pin ISP Cable: To connect the programmer to the VCDS PCB. 2. Identifying Connection Points
You must open the interface casing to access the PCB. Look for the ISP (In-System Programming) pads. Most ATmega162 VCDS clones have 6 pads labeled or arranged in a standard layout: VCC (+5V) GND (Ground) MOSI MISO SCK RESET
Note: You may need to solder header pins or small wires to these points to maintain a stable connection during the flash. 3. The Reflashing Process
Connect the Programmer: Hook up your USBASP to the ISP pads on the VCDS PCB.
Verify Chip Communication: Use ProgISP to "Read ID." If it returns 0x1E9403, your connection to the ATmega162 is successful.
Set Fuse Bits: Fuses must be set correctly for the chip to function with the VCDS crystal. Common settings for ATmega162 in these cables are: Low: 0xCD High: 0x19 Ext: 0xFF Lock: 0xFC (to prevent further overwriting) Flash Firmware: Load the Flash (.hex) file. Load the EEPROM (.eep) file. Click "Write" or "Auto" to begin the process. 4. Post-Flash Setup "Target doesn't answer" (AVRDUDE error)
Once the ATmega162 is reflashed, you often need to fix the FTDI chip (FT232) so it matches the new firmware:
Use a tool like MREPAIR or FT_Prog to change the VID/PID if necessary (usually 0403/FA24 or 0403/6001).
Disable your internet connection before opening the VCDS software to prevent the cable from being re-blacklisted. 5. Where to Find Firmware
Firmware files are typically shared in automotive forums like MHH Auto or Digital Kaos. Ensure you are downloading a version compatible with your specific "Loader" (e.g., Kolimer's Loader or VIIPlusLoader).
⚠️ Critical Warning:
Reflashing a VCDS cable with third-party or cloned firmware often violates Ross-Tech’s intellectual property and terms of service. Genuine Ross-Tech interfaces use locked/protected chips. This information is provided for educational purposes, legacy hardware repair (e.g., recovering a bricked DIY cable), or understanding the electronics. Using a counterfeit VCDS cable is illegal in many jurisdictions.
vcds_ firmware.hex and vcds_eeprom.eep.After writing, read the flash back and compare it to your .hex file. If they match, disconnect the programmer. Reassemble the VCDS interface and plug it into USB. Windows should detect a new device, and the VCDS software should attempt to connect.
Open AVRDUDESS. Configure:
usbaspatmega162If you cannot read the fuses, check your wiring. A successful read means the chip is alive.
The ATmega162 is an 8-bit AVR RISC-based microcontroller from Microchip (formerly Atmel). It features 16KB of flash memory, 1KB of EEPROM, and 1KB of SRAM. In the context of a VCDS interface, this chip acts as the translator between your PC’s USB commands and the K-Line or CAN-Bus protocols used by your car.