Sony have released 5.02 firmware for the PSP. Not a major update by far. One of the updates is only for Japanese PSPs (the One-Seg one, A TV Tuner for the PSP exclusive to Japan).
Here is the changelog:
- (One-Seg) to update the list of channels, Niigata Prefecture – Shiga Prefecture, Takada – Koka local channels can be received properly.
- System software stability during use of some features, including PlayStation(R)Store, has been improved.