I think the firmware is region specific because I remember when I used to update via computer and USB, the sony website would warn not to install the firmware unless you had a US psp (which I do). As far as finding out where yours comes from, I cant think of how from the top of my head. I could suggest maybe updating from network update if you have a wifi connection. It seems to find the correct version with no user input.
Each PSP has a model number. On the original PSP, it is located on the bottom in the silver section near the headphone jack. If it says PSP1001, it is a North American PSP. If it says PSP1000, it came from Japan. If you have a "Slim & Lite" it should be somewhere on the system, the only difference being that it would be PSP200x. I know that other numbers represent other regions, but I cannot confirm the correspondence of numbers to region.
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