donu about P1 firmware, im using w950..if you wana faster walkman phone you should choose w960... as i've said those are not walkman phones using 4gb, it will slow down the processing[performance]. i choose to stick to 2 gb woth my k750i and 4 gb with w950i. they rock! with P1, if Im in your shoe, ill choose 2gb, it is much stable than using 4 gb. youll have a bad day using 4gb and always hung up than using a stable 2gb MS... hope im helping you

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