Car: BMW 525 2011
Eeprom: CAS4 01L15Y
You need have a working bmw cas4 programmer and a good bmw key programmer.
Here: vvdi prog to read cas4 & vvdi2 to program a new key
Step 1 VVDI Prog read BCM
Select type: 4-immobilizer, brand: BMW, type: CAS4-1L15Y
Click on Connection Diagram
Connect the MC9S12 adapter to the BCM
Remove the component and solder back after the operation is complete
Read CAS4 1L15Y
Then save the bin file
Step 2 VVDI2 bmw make dealer key
Open VVDI 2 Quick Start
Go to vvdi BMW
Select Key Learn-> File make key
Select Type: CAS4 1L15Y
Load the EEPROM dump file: open the bin file (read by vvdi prog)
Note the remote frequency, then select Key ID7
Make dealer key
Note: preparing dealer key needs about 30 minutes; the windows may be false read. Please wait for the end. Input the new key to the programmer, then continue.
Write the key successfully!
Go to the car with the key. No need to write back eeprom.