Judging from the comments made on PSPGen (The GEN/Miriam Custom Firmware homepage) Version 4.00 GEN might not see the light of day as a public release. Although a beta version of 4.00 Gen has been completed by Miriam, Team GEN might keep this release internal as they are aware that Dark_AleX and team M33 [...]

Team M33 have returned and are busy working on PSP Custom Firmware 4.00 M33. The master himself Dark_AleX is working on this now. Its also reported that there will be a brand new recovery menu in 4.00 M33, no other new features to be added at this stage other than what was included in the [...]

PSP Firmware 4.00 has been decrypted and by the same team that brought us PSP Custom Firmware 3.95 GEN. So what does this mean to us? Well this opens the door up now for either 4.00 GEN or M33 custom firmware. Decrypting the firmware is the first step towards Custom Firmware enlightenment.
From the PSPGen website, [...]

PSP Firmware 4.00 has been released by Sony. This slighty lack lustre release features the new internet search feature via google and the ability to control the view speed of videos on the memory stick! Wow I hear you say…. Not much of a release for a x.00 step up in Firmware.
* [Internet Search"] has [...]

Sony have posted on thier blog that PSP firmware 4.00 will be released soon. While there are some new features, nothing major has been added like the much wanted DivX support. Oh well I guess next release? Fingers crossed, come on Sony its what were after! Question is will M33 / Dark_AleX be releasing 4.00 [...]