It doesn't work that way.
The N95-2/-4 is a S60v3FP1 phone and will stay that way. In order to have FP2 features then you need to have a phone with an operating system that supports them. The N85 or N96, for example. There have never been examples of a FP1 phone receiving features from FP2 in an update. There is, however, the N82 that the carousel feature right from the beginning, and it is the only FP1 phone to have it AFAIK.
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