Will This Ecu Swap Work?

[JR20516V 6]

2.0 T from Xantia CT conversion complete however we have found that the immobiliser has locked. The keypad has been discarded ages ago:{

So here is the solution i think but need surety before attempting.......

 

Insert my Xantia CT ECU into a friends CT car and put in my code to unlock it. Is this all thats needs to be done as i remember there may be some other thing to do during this process. Disconnect battery after???

 

 

Anybody know the sequence for doing this please?

[Daviewonder 533 3 Cars]

From what I've read on here. Plug your ecu into his car, turn ignition on, enter code, unplug ecu with ignition still on. It should be unlocked.