January 06, 2026

How to Read BMW BDC2 Encrypted Key and Add Key with Keydiy KD-X4

Good news! Keydiy now supports BMW G series BDC3 encrypted key cloning via reading original key data method. Here is the instruction on how to add a spare BDC3 locked key using Keydiy KD-X4.

 

Tools used:

Keydiy KD-X4(or KD-MAX)

Original BDC3 encrypted key

New original BDC3 key orKD FGB58 remote

New dedicated wiring harness (for encrypted BDC3, VAG 5C 5D key data reading)

KD G Function license activation

Add BMW BDC3 Encrypted Key with Keydiy KD-X4 1

Requirement:

This function requires KD-X4 firmware V1.52 or newer version.


Add BMW BDC3 Encrypted Key with Keydiy KD-X4 2

 

How to update Keydiy KD-X4 firmware to V1.52?

In App Home page, click Update- Update KD Device. Check latest version and update firmware.

V1.52
Add the function of reading and writing encrypted BMW keys.
Add BMW BDC3 Encrypted Key with Keydiy KD-X4 3

How-to:

Go to Remote Function- Smart Key Clone- BMW BDC3/BCP Smart Key Clone- G Chassis/BDC3 Clone

Solder wires to the original key according to the wiring diagram.

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Add BMW BDC3 Encrypted Key with Keydiy KD-X4 5

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We have soldered the original car key properly.
Click Read to read original key data.

Connect the wiring harness adapter toKD-X4main unit.
Read original key data successfully.
Save file.


Add BMW BDC3 Encrypted Key with Keydiy KD-X4 8

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Now start generate key.
Before generating the key,remove the wiring harness with KD-X4.
Put the KD FGB remote PCB to the KD-X4’s coil.
Now start wireless generation.

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Select generating KD-FGB remote.
Generate remote successfully.

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Then you can install this key into the original factory shell,

Keep in mind, don’t use both keys in the car. Keep them separate.

Posted by: jean at 07:16 AM | No Comments | Add Comment
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