How to tell if the PSP you're buying is hackable

Tom says,

The letter just above the bar code on the product packaging lets you know which firmware version your PSP will come with before you shell out $250 for what may be something you did not want.

I have verified this to be true, my PSP was 1.51 and has a B on the box. As long as the version is 2.0 or lower, it can be upgraded to 2.0 (if necessary) and then downgraded to 1.5, allowing for homebrew programs such as the awesome pspradio (which allows me to listen to shoutcast stations anywhere with WiFi) or other OK programs like the notepad or filemanager, even ports of Quake and Doom. Using the quick guide (which could use some comments to confirm D and E), one can decide which PSP to give to your loved one for them to enjoy in more than just the Sony Approved ways.

Links: Firmware 2.0 (US), to upgrade to if you have anything higher than 1.5 but lower than 2.0; MPH Downgrader (to go from 2.0 to 1.5); Firmware 1.5 (To upgrade to from the fake 1.0 after the MPH Downgrade); PSP Homebrew; PSP Quake; Doom; PSP Radio (awesome).

Link