you could prolly do it with a web server if you could then do every thing from there it would work like this.

1. PSP sends data to proxy proxy sends data to sony socom.
2. sony socom sends data back to proxy proxy edits data.
3. data is send to psp.
4. PSP thinks there is an update.
5. PSP sends data to proxy.
6. proxy sends its own data to PSP.
7. data says thers a new update.
8. PSP says please plug in AC addapter do not turn off psp or remove MS please wait for update.

just some thing i was thinking