This weekend news came out that you can play homebrew on any PSP firmware version, from version 1.0 to the latest 3.50. The game that make this posible is Lumines. They say it’s a exploit using a buffer overflow in the savedata file. You need either the US or European version of Lumines.
This means that you don’t have to flash or hack your PSP firmware. As of now there is only “Hello World” that use the exploit. But the people (Noobz) who found the exploit say that they will release a HEN and a downgrader.
When the news came out, Lumines start selling better and better on Amazon.com and it’s now (at time of writting) the best selling videogame. It went up close to 14.000% and sells better than Nintendo Wii.
You can get Lumines from: