NOTE: This is not counting the useless 'expansions' of existing custom firmwares that mearly add an extra recovery menu, with the same options as the first, and 'breaks' at the same time as first (of course, the only way to 'break' the recovery menu is thru self-stupidity). There are 9 different unofficial firmwares, which are ġ.50 Custom (Many variations, Shows as 1.50 usually, examples 1.50 PoC, 1.50 Casual, 1.53, 1.63 IE, etc)

There are 27 different official firmware versions, which are In total, there are 36 different firmware versions The location of MAC Address and Nickname change places in some firmwares (Nickname at top, MAC address at bottom). Nickname: (The nickname you put onto psp) System Software: (Your PSPs firmware version) MAC Address: (Your PSPs specific MAC address)

To do that go to Settings then find System Settings then go to System Information. To get ScummVM running on your PSP, first we need to look at the PSP to find out its firmware version. Highest official firmware that can be degraded - 3.50 (3.71 with Pandora's battery) Highest official firmware that can run homebrew - 3.50 Latest official/unofficial firmware releases - 3.71/3.52 M33 (Original PSP)/3.60 M33 (PSP Slim and Lite) |-3.3 - Downgrading firmwares 2.81~3.50 - REQUIRES UNPATCHED Lumines |-3.2 - Downgrading firmwares 2.81~3.03 - REQUIRES UNPATCHED GTA:LCS |-2.5 - Custom Firmwares (excluding 1.50 custom firmwares)

Custom firmware ps3 3.70