OBDSTAR G3 Failed to Decode Skoda EDC17C74 CS Code Solution

Here comes a problem:

It’s a 2017 Skoda MQB model with an EDC17C74 ECU. All keys have lost. A customer was trying to make key with OBDSTAR X300 Classic G3 programmer on bench.

He connected the ECU to the G3 on bench and read the EEPROM successfully, but the strange thing is that he can also read the FLASH successfully, but when it reads the sectors, it goes super fast, and the BLUE LED on the MP001 barely flashes to indicate communication with the ECU. It’s like the ECU is being read incorrectly, and when he used the special “decrypt immo data” option, the CS is really strange.

Here is the clue.

Edc17C74 and CP74 are Immo 6 and have the SHE sector. It reads ok, but these ECUs have SHE sector security hardware extension. No tool in the world can decrypt it and no way to decode it.  You cannot read CS code.

 

What is IMMO6 SHE?

IMMO6 (or WFS6) refers to the 6th generation of the Volkswagen/Audi Group (VAG) immobilizer system, while SHE stands for Secure Hardware Extension—a hardware-based security layer used in modern ECUs. Part of immo data is stored not in eeprom but in SHE – which you can’t read.

The SHE (Secure Extension Hardware) module implements advanced AES-128 encryption and dynamic challenge-response authentication, making it highly resistant to hacking or unauthorized ECU cloning.

 

 

How to Program MQB All Keys Lost with IMMO6 SHE ECU?

Solution 1:

Order dealer key for 120€ and program with online software ODIS.

 

Solution 2:

Order dealer key and use mlb tool to add key.

For example:

Use the dealer key to read immo then leave dealer key with CS code. Key already has sync then you can make more keys if you want.

Order a dealer key, read immo data on the dealer key with VVDI MLB Tool (MQB adapter) or KD-MP tool, and make dealer key and learn keys.

 

Solution 3: 

Make ecu immo off, and when add on calculation time another car cs code to fill the sync calculation and make key and oem ecu immo off.

OBDSTAR G3 Program 2025 Nissan Magnite Proximity Key

OBDSTAR X300 Classic G3 programmed 2025 Nissan Magnite proximity smart key successfully.

 

Go to Nissan, select the model and Proximity function.
Select Program Keys.
This function requires network connection.

Follow 4 steps to program keys.

Press Start button to execute key programming function.

1. Configure system
Executing this function will erase all the keys of the vehicle.
Only 2 new keys can be programmed each time.

Insert the original key into the slot.

2. Read current key number
G3 read current number of key: 1.
Insert new smart key into the slot.
2 keys detected.

3. Verify PIN Code
G3 asks to enter a 32-digit PIN code.
This code must be obtained from a 3rd party provider using the VIN.

4. Program keys
Insert the proximity key 1 to be programmed into the slot.
Program key 1 successfully.

Insert a new proximity key to be programmed into the slot.
Program 2nd key successfully.

Test both keys.

 

OBDSTAR G3 Full vs OBDSTAR ECU Master

Q: What is the difference between OBDSTAR X300 Classic G3 full version and the new OBDSTAR ECU Master ECU flasher—aside from not having to use so many adapters?

Here is the clue.

OBDSTAR G3 vs ECU Master

The X300 Classic G3 is a standalone Android tablet-based all-in-one key programmer (with optional expansions), while the ECU Master is a PC-based ECU flasher/interface focused on advanced cloning, reading/writing, and related ECU tasks. They complement each other rather than directly competing in all areas.

Overview and Target Users

• OBDSTAR X300 Classic G3 (Full Function): A versatile, portable key programming and diagnostic tool for locksmiths. It excels in IMMO (immobilizer) work, and vehicle support across cars, motorcycles, EVs, and marine. Optional licenses expand it into mileage correction, airbag reset, and limited ECU cloning. It is an upgrade over the X300 DP Plus with superior hardware and built-in protocols.
• OBDSTAR ECU Master: OBDSTAR’s first professional PC-based ECU flasher (released around mid-2026). It is a dedicated hardware interface for deep ECU work (ECM/TCM/BCM cloning, flashing, advanced functions) on passenger cars, EVs, motorcycles, and HD vehicles. It connects to a Windows PC and does not function as a standalone device.

 

Hardware and Design Comparison

X300 Classic G3:

• Android 11 tablet with RK3568 Hexa-Core processor, 4GB RAM + 64GB storage.
• 8-inch high-brightness laminated screen (1280×800), 8MP rear auto-focus camera.
• Built-in: CAN-FD, DoIP, Fault Tolerant CAN, RFID, Renault converter, remote test.
• Battery: ~9000mAh; includes MP001 (all-in-one programmer replacing P003+) and P004 adapters, plus BENCH harnesses.
• Portable, wireless (BT 5.0, dual-band WiFi), HDMI, OTA updates.

ECU Master:

• Compact interface (~0.7kg, 176x115x31.7mm) with STM32H723 + STM32F407 CPUs.
• PC-based (Windows 10+ required); no built-in screen or battery for standalone use.
• Built-in advanced protocols and adapters (no need for separate MP001/P003+ or CAN-FD in many cases).
• Focused on bench/boot/JTAG/BDM/OBD modes for ECU work.

Winner for portability: G3.

Winner for dedicated ECU bench work: ECU Master (deeper integration with PC software).

 

 

Core Functions Comparison

Key Programming & IMMO (G3 Strength):

• G3: Full support for programming IMMO keys, making dealer/start keys, renewing keys, remote testing, transponder R/W, IMMO OFF, ECU unlock, and more. Excellent coverage for cars, motorcycles (many brands without pin), EVs, HD, and marine/jet-skis.
• ECU Master: IMMO OFF/ON, data decryption/convert in supported ECUs as part of cloning/advanced work, it is not a key programmer.

ECU Flashing/Cloning (ECU Master Strength):

• G3: Basic ECU advanced functions, unlock, R/W EEPROM/MCU. ECU cloning (DC706-like) is an optional paid activation with more limited coverage compared to dedicated tools.
• ECU Master: Primary focus — comprehensive ECM/TCM/BCM cloning via OBD/BENCH/BOOT/JTAG/BDM for thousands of units (Bosch, Continental, Delphi, etc.). Supports advanced operations like CheckSum, Virgin Reset, VIN R/W, mileage calibration, IMMO data handling, and MAPs. Stronger in passenger car, EV, motorcycle, and especially HD/truck/tractor coverage.

Other Functions:

• G3: Optional cluster calibration (mileage), airbag reset (P50-like), test platform. Basic OBDII.
• ECU Master: Airbag/BMS/SAS reset (P50-like), CheckSum, etc., within ECU context. Configurations include A (Car/EV), B (Motorcycle), C (HD), D (Airbag/etc.).

Vehicle Coverage:

• Both support cars, EVs, motorcycles, but G3 is broader for key/IMMO across vehicle types (including marine). ECU Master offers deeper, more specialized ECU cloning, especially for HD heavy-duty trucks and specific modern/locked ECUs.

Updates, Pricing, and Practicality

• Updates: G3 offers 2 years free (OTA). ECU Master updates start from manufacture date (duration TBD; PC-based software updates).
• Usability: G3 is ready-to-go standalone for mobile locksmith work. ECU Master requires a PC but provides a more powerful, intuitive interface for complex bench/flashing jobs with anti-misoperation features.
• Cost: G3 full-function packages include many features (with options for extras). ECU Master comes in modular configs (A/B/C/D) for targeted purchasing. ECU Master often noted as competitively priced vs. rivals.

 

Summary Table

Aspect	X300 Classic G3 Full	OBDSTAR ECU Master
Primary Role	Key programmer + multi-function tool	Dedicated PC-based ECU flasher/cloner
Form Factor	Standalone Android tablet	PC interface hardware
Key/IMMO	Excellent (core strength)	No
ECU Clone/Flash	Good (with optional license)	Excellent (core strength, broader/deeper)
HD/Motorcycle	Strong motorcycle key support	Strong cloning support (esp. HD)
Portability	High	Low (needs PC)
Best For	Locksmiths, mobile key work, all-in-one	ECU repair shops, deep cloning/flashing

 

Recommendation:

Choose the X300 Classic G3 if you need a portable, versatile tool centered on immobilizer key programming with the ability to expand into other areas (airbag reset, ecu cloning, odometer correction). Opt for the OBDSTAR ECU Master (or both) if your focus is professional ECU cloning, flashing, virginizing, and advanced electronics repair — especially for HD or high-volume bench work. Many professionals use the G3 for keys and pair it with a dedicated flasher like the ECU Master or DC706 for deeper ECU tasks.