Post your PSP's complete firmware history here! This also includes stuff like swapping PSPs, buying new ones and upgrading to custom firmwares.

Mine:

2.50

SWAPPED PSP (this was ages ago, before the downgrader or eLoader Brown Ale came out)

1.52 - 2.00 - 1.50 - 1.00 - 1.50 - 1.00 - 1.50 - harleyg's 1.50 custom firmware 0.2 - 1.50 - 2.71 SE-A - 2.71 SE-B - 2.71 SE-B' - 2.71 SE-B" - 2.71 SE-C - 3.02 OE-A - 3.02 OE-B

So that's 17. Quite a lot in my opinion.

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