Xhorse VVDI Prog Read ChangAn MT22.1 ECU

 How to read and write ChangAn MT22.1 ECU with Xhorse VVDI Prog programmer?

1. Cut the engine computer board, find the wiring diagram, and then use a multimeter to point out the pins to facilitate soldering.

2.  After soldering the wires, open the VVDIProg software.

Select 2 Microcontroller- Motorola MC9S12 series- MC9S12XET256 encrypted.

3. Hit Read Chip ID and identify ID first.

4. Click on Unlock if the chip has a password.

5. Then click on Read data and read the D-FLASH and PLASHF data.

6. Write modified data to the ECU.

Images attached:

How to Connect Xhorse EWS4 Adapter with VVDI Key Tool Plus?

 Procedure to program BMW EWS4 key with xhorse vvdi key tool and EWS4 adapter:

1). Read eeprom.

2). Make dealer key (pcf7935 or Universal xhorse xt27a super chip transponder generated as vw id33),

Don’t write file back to EWS!!! This system no need to write back.

Put everything back, start the car. Job done.

Tips to install the Xhorse EWS4 adapter with key tool plus:

Xhorse adapters for reading dumps are quite reliable if you know how to use them.

Before installing the EWS4 adapter, the contacts should be cleaned several times.
After installing the adapter, you need to read the dump 2–3 times and save it after each read.
Then you compare all the dumps you have read (Xhorse Key Tool Plus has this feature).
If they are identical, you can proceed to create a dealer key and write the generated file back to the EWS.
If you read the dump with errors — which often happens when reading via adapters — and then create a dealer key and write the new dump back, that can permanently damage the EWS.

There are two ways to connect the Xhorse EWS4 adapter with key tool plus:

Way 1: Connect Key Tool Plus with EWS4 adapter via multi-funtion converter.

Way 2: 

Connect key tool plus with EWS4 adapter via XDNP14 DB15-DB25 EWS4 adapter.

Alternative approach:
The cheapest and most reliable way is often to source a complete EWS and DME from the same vehicle (for example, from a junkyard), install them together, and program new keys.
This avoids the risks of bit errors, incorrect dumps, and complex synchronization with existing modules.
Once installed, the new EWS, DME, and keys will work seamlessly together, resolving the problem without the need to restore corrupted dumps.

VVDI Key Tool Max vs Keydiy KD-MAX

 What is the difference between Xhorse VVDI Key Tool Max and Keydiy KD-MAX?

Both are popular remote generation tools used by locksmiths and automotive professionals.

Comparison Table: Xhorse VVDI Key Tool Max vs. Keydiy KD-X2

Feature	Xhorse VVDI Key Tool Max	Keydiy KD-MAX
Image
Screen/Display/Battery	5.0 inch touch screen. 1280*720 resolution. Battery 3375mAh	5.0 inch LCD touch screen. 1280*720 resolution. Battery 3375mAh
Operation	Standalone operation on device; supports wireless control via phone app	Standalone operation on device; supports wireless control via phone app
Remote Generation	Supports generating universal remotes, garage remotes, and smart keys (e.g., Jeep Compass, Renegade)	Supports generating remotes, including some not supported by Xhorse (e.g., Alfa, Geely, Jaguar, VW)
Remote Copy/Clone	Yes	Yes
Transponder Clone	Supports cloning ID46, ID48, 4D, and more; requires tokens for ID48 96-bit cloning (€8 each)	Supports cloning ID46, 4D, ID48; ID48 96-bit cloning is free and faster (~minutes vs. >1 hour for Xhorse)
Special Chip Generation	Yes, supports superchips for wide vehicle coverage	Yes, supports ID46, 4D; limited compared to Xhorse superchips
Chip Simulator	No	Yes, supports ID46, 4D
Remote Simulator	Yes, unique feature for simulating remotes	Yes, can simulate remotes via tool and Android app
Write Key via Dump	Yes	No
Acquisition Test (FSK/ASK EEPROM Frequency)	Yes, for remote issue analysis	No
Frequency Test	Yes, detects immobilizer/remote frequencies	Yes, fast and reliable frequency testing
Immobilizer (IMMO) Programming	Requires separate Mini OBD tool for IMMO functions	Requires separate KD-MATE programmer
ID/IC Copy	Yes	Yes
Unlock Key	Yes, supports wider coverage than Lonsdor, including Toyota/Lexus smart keys	Yes, wider coverage than Autel KM100 for some brands (e.g., Alfa, Jaguar, VW)
Toyota Smart Key Support	Yes, supports unlocking and cloning Toyota/Lexus smart keys	Yes, supports generating some Toyota remotes; weaker than Xhorse for smart keys
Ignition Coil Signal Detection	Yes	Yes
AutoVIN	No	No
IR Signal Detection	No	No
Key Charge	Yes	Yes
PCF7935 Chip Cloning	No	Yes
Vehicle Coverage	Strong for smart keys (e.g., Jeep, BMW); broader coverage for newer remotes	Strong for specific brands (e.g., Alfa, Geely, Jaguar, VW); some cloud remote options
Software Updates	Free lifetime updates	Free lifetime updates
Build Quality	Higher-quality remotes and superchips; well-organized database	Decent quality, but some issues with older remote renewing (e.g., Kia/Hyundai)
Additional Features	Supports OBD programming with Key Tool Max Pro; battery leakage/voltage detection	Simulates proxy keys via app; faster ID48 cloning
User Feedback	Preferred for ease of use, iPhone app compatibility, and superchip versatility	Reliable but app is clunky; some remotes not supported by Xhorse

Key Differences and Analysis1.Hardware and Operation:

• Xhorse Key Tool Max: Features a touchscreen for standalone operation. The Xhorse app supports wireless control, especially with iPhones, and is noted for being user-friendly.
• Keydiy KD-MAX: also standalone device with touch screen.

2. Remote and Chip Programming:

• Xhorse Key Tool Max: Excels in generating and cloning a wide range of remotes, including smart keys for vehicles like Jeep Compass and Renegade, which KD-MAX doesn’t support yet. It also supports superchips for broader vehicle coverage and unique features like remote simulation and FSK/ASK EEPROM frequency collection for troubleshooting.

• Keydiy KD-MAX: Offers free and faster ID48 96-bit cloning (minutes vs. over an hour for Xhorse, which requires tokens at €8 each). It supports some remotes not available on Xhorse (e.g., Alfa, Jaguar, VW) and can clone PCF7935 chips, which Xhorse cannot. However, its smart key support is weaker.

3. Immobilizer (IMMO) Support:

• Xhorse Key Tool Max: Requires a separate Mini OBD tool for IMMO programming, limiting its standalone IMMO capabilities. The Key Tool Max Pro version adds built-in OBD programming for advanced BMW, Toyota, Ford, and GM procedures.

• Keydiy KD-MAX: Also requires a separate KD-MATE IMMO programmer, making it less versatile for IMMO tasks compared to tools like Autel KM100.

4. Vehicle Coverage:

• Xhorse Key Tool Max: Stronger for smart keys and newer remotes, with a well-organized database and broader coverage for models like BMW and Jeep. Its superchips enhance compatibility across a wide range of vehicles.

• Keydiy KD-MAX: Covers specific brands better (e.g., Alfa, Geely, Jaguar, VW) and offers cloud remote options, but it lags in smart key support and has issues with older Kia/Hyundai remotes.

5. Unique Features:

• Xhorse Key Tool Max: Offers remote simulation, write key via dump, and acquisition test functions, which are exclusive to this device among the compared tools. The Key Tool Max Pro adds OBD diagnostics and battery testing.

• Keydiy KD-MAX: Includes a remote simulation feature via its Android app and supports PCF7935 chip cloning, which Xhorse lacks. 

6. Build Quality and Support:

• Xhorse Key Tool Max: Praised for higher-quality remotes and superchips, with a user-friendly app and strong database organization. It’s seen as overtaking Keydiy in coverage and innovation.

• Keydiy KD-X2: Reliable but criticized for a clunky app and unresolved issues with older remotes (e.g., Kia/Hyundai). Its development is stable but focuses on new products rather than fixing bugs.

Recommendations

• Choose Xhorse VVDI Key Tool Max if:
  • You prioritize standalone operation with a touchscreen and wireless app control.
  • You need strong smart key support (e.g., Jeep, BMW, Toyota) and superchip versatility.
  • Unique features like remote simulation, FSK/ASK frequency analysis, or OBD programming (with Key Tool Max Pro) are important.
  • You value a well-organized database and high-quality remotes.
• Choose Keydiy KD-X2 if:
  • You work with specific brands like Alfa, Jaguar, or VW, where KD-MAX has better coverage.
  • You need PCF7935 chip cloning or cloud remote options.

General Advice: Both tools have strengths and weaknesses, and no single device covers all scenarios. Many locksmiths recommend owning both to maximize vehicle coverage and functionality, as each supports remotes the other may not. If IMMO programming is a priority, consider pairing either with a dedicated IMMO tool like Autel KM100 or Xhorse Mini OBD Tool.

Xhorse VVDI2 V7.5.0 Device Not Found Solution

 Some users reported that they had a problem with Xhorse VVDI2 software V7.5.1.

1). Updated my vvdi 2 to 7.5.0 and now it will not connect to unit.

2). Is anyone experiencing issues with your vvdi2 not being able to connect for any functions after the latest 7.5.0 update. In the Update Tool kit I can read my device with the latest firmware, however I can’t connect (Device not found). Software app shows installer V7.3.7. Drivers seems all good. FYI, have tried to download Both 7.5.0 and 7 3.7 software from the web for another laptop, however it doesn’t give a landing page.

3). After installing VVDI2 7.5.0 it does not matter which brand/section, no device found.

There is a bug in 7.5.0 software.

V7.5.1 software is out and don’t forget to update firmware. Big bugs fixed.

Free download VVDI2 software V7.5.1

MEGA LINK

Download new version 7.5.1 loader software. Deleted old 7.x.x installer software before downloading the new loader. Then updated device firmware again in the Xhorse Upgrade Tool Kit.

How to Connect Xhorse Audi BCM2 Adapter V2 with Multi Prog

 The Xhorse XDNPA2GL Audi BCM2 Encrypted V2 Solder Free Adapter does not come with the orange block to power it and connect it to vvdi tools, how to connect the adapter with vvdi key tool plus and multi prog?

Here is the clue.

Key tool plus and multi prog software will show how to install the BCM2 v2 adapter.

After installing the Audi BCM2 V2 adapter, connect adapter with multi prog or key tool plus via the 16-pin cable in the package.

There are two adapters in the BCM2 V2 adapter package, one for multi prog and another for key tool plus.

With the BCM2 adapter v2, you don’t need to connect to the power supply. 

For multi prog:

Connect Audi BCM2 adapter with multi prog via this multi-prog adapter 16-pin cable.

For vvdi key tool plus:

Connect BCM2 V2 adapter with key tool plus via this 16-pin cable.