Pair cas with ecu

[nikte]

If I read this cas can be paired with new ecu and I can use old key and start the car?
Bmw 530d
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[brend]

You need from cas or old ecu isn nr. rewrite by nwe ecu or used.And after by diagnostic equpment (ISTA,LAUNCH,PA-SOFT,.......)you need senchronization cas by ecu,and no need nwe key.
If you changed isn nr. in cas you need nwe key or key chip.
Best sulution (BDM) clone original by used ecu .