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You should be able to change the variant coding in the ECM with opcom,
long time since i did one now and i can't remember if you'll need to enter the security code to allow access,
do you have the code for the replacement ecm you fitted ?
 

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If you know someone with opcom it's a couple of minutes just to try a variant code change,
i seem to remember you don't need the sec code but not 100% on it.
 
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