B7 key upgrade problem.

A4hybrid

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Hi all.

Hoping you can help.

I bought a new b7 key and had it cut today and managed to sync both keys using the door lock/window down method. Both keys were working fine but after about a hour I went out to grab something from the car and neither key remote unlocks the car.

They both start the car but no matter what I've tried I can't get the original or the upgrade to remote unlock/lock.

Any help would be appreciated.
 

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