Saxo vtr ecu unlocking

[Hazell17]

Hi I have vtr been mapped I am now breaking for parts but I didn't get ecu unlocked I have read online that u start car remove immobiliser black box and turn engine off to unlock the ecu put do I need to keep this unplugged also if I plug it into another car does there box need to be disconnected ? What about transponder ?

[Ali123]

the black box on the other car must also be disconnected, if not it will just relock the ecu

[Hazell17]

Ok thank you what about the transponder leave it connected or disconnect it ?