If you've serviced it yourself - you've already invalidated the warranty. But if you've taken it to a VAT registered garage (who have to use BMW parts) then they should reset it for you. Its their job to do that.
Why on earth do you want to tamper with a car that is still in warranty?
If heavyend doesn't want to service the car when the car is telling him to do so he/she will end up invalidating the warranty anyway.
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