How to Open BMW U Chassis BDC03 Smart Key?

 BMW U-Series BDC3 smart keys are extremely difficult to disassemble. Extra caution must be taken when copying these BDC3 keys.

Solderless clips only work for G-Series BDC3 models; soldering is mandatory for U-Series.
KEYDIY offers keys compatible with the U-Series- KD FGB57.

 

How to Disassemble BMW U Chassis BDC3 Smart Key?

Step 1: Disassemble the Key Shell

Remove the silver side trim.

Take out the mechanical key.

Remove the battery tray.

Step 2: Disassemble the Mainboard

First, remove the lower shell.

Use a screwdriver to push the clips on the upper cover, then remove the car emblem and side buttons.

Step 3: Take out the Circuit Board

Use a blade to cut through the ultrasonic welding seam.
Carefully cut along the ultrasonic welding line.

Pry open the clips.
The key circuit board can now be removed.