How to Add 2025 BYD Formula Leopard Ti7 Key with Lonsdor K518 Pro?

Adding a new smart key to the 2025 BYD Formula Leopard Sealion 7is a straightforward process when using the Lonsdor K518 Pro. This guide provides a concise, step-by-step walkthrough of the programming procedure.

Preparation and Tools Needed

Before starting, ensure you have the following items ready:

Lonsdor K518 Pro Key Programmer

OBD communication cable

Original car key and the new smart key

A stable internet connection

Step 1: Generate the Smart Key

First, you must prepare the new key to be recognized by the vehicle’s system.

1. Navigate to Generate Smart Key > BYD > Formula Leopard >Sealion 7 2025 ID4A

2. Place the new key into the K518 Pro's card slot.

3. Click Generation and wait for the "Generated successfully" message.

Step 2: Read Data and Password

To access the immobilization system, you must retrieve the vehicle's security data.

1. Locate and remove the cross-domain platform box located below the steering wheel to facilitate password reading.

2. On the K518 Pro, select Immo & Remote > BYD >Smart Key > Formula Leopard Series > Sealion 7> 2025- > Program smart key

3. Follow the on-screen prompts: Turn off the ignition and turn on the hazard lights (flashing lights).

4. Select Method 3: Disassemble the left EEPROM of the CEM module to obtain the 32-bit PIN code

5. The device will read the EEPROM data. Once successful, save the file to your device.

Step 3: Program the Smart Keys

Note: All keys not present during this process will be deleted from the system. You can program up to 4 keys total.

1. Select the saved EEPROM file to begin programming.

2. Program Key 1: Place the first key (original) in the vehicle's sensing area and click OK until "Program complete" appears.

3. Program Key 2: Place the second key (new) in the sensing area and click OK.

4. Once both keys are registered, click Cancel to finish the session.

Step 4: Verify Functionality

Always test both keys to ensure the immobilization and remote features are working perfectly.

Engine Start: Press the brake and the Start button with each key individually to confirm the engine starts.

Remote Features: Test the Lock and Unlock buttons on both the original and the new smart key.

The programming for your 2025 BYD Formula Leopard Sealion 7 is now complete.

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Lonsdor K518 Pro Wring Diagrams for BMW BDC3 &VAG 5C/5D

The Lonsdor K518 Pro Key Programmer, when paired with the Encrypted Solder-Free Adapter Kit, provides a powerful solution for reading encrypted data across premium vehicle brands. This setup enables advanced programming for BMW G/U chassis systems and smart key reading for VW, Audi, and Porsche.

Software & Licensing Requirements

To utilize these features, ensure your device meets the following criteria:

K518 Pro Full Version: The device must have an active subscription period to function.

K518 Pro FCV: This specific version requires the manual activation of the BMW BDC License and the VW MQB49 5C 5D License.

Technical Wiring Diagrams

A proper connection is vital for successful data reading. Reference the diagrams below for specific vehicle modules:

BMW G-Chassis /U-Chassis with LCD Screen:

Volkswagen 5C/5D Systems

Audi 5D Systems

Porsche 5D Systems

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