The Sony handheld went from 1.51 to 1.52. The update apparently stabilizes the system software and fixes some small bugs. [Sony]
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Oh no, not a firmware update!
Seriously, it's not a big deal. I don't think I'll ever understand why so many people get up in arms over having to update once in a while. Even if it's just a minor fix that doesn't affect me I don't care.