When the code is lost, you can not get the unlock code directly from the radio by pressing buttons. The R2896 is not the code, I think it's the revision number.
There are some vendors on eBay that will provide an unlock code for about $5. I have also heard that Becker will do it if you contact them directly as well as your local Porsche dealership. If you are lucky, it may be written somewhere in the car. Original paperwork has a card with the code number. I wrote it with a marker on my battery and the radio itself.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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