Ok so your still on 5.00 M33-6 and want to play some of your 5.50 or 6.00 UMD games on your custom firmware? Well now you can with mc707’s Eboot patcher. It basically works the same as Yoshihiro’s 5.55 & 6.00 games decrypter but for custom firmware 5.00 M33 and CFW 5.03 MHU
OK here’s how [...]

Dark_AleX has released Custom Firmware 5.00 M33-6. This same update is DAX’s attempt to correct the low speed Memory Stick issues that has been somewhat of a problem for some users since 3.71 firmware was released.
5.00 M3-6
———-
Changes in 5.00 M33-6:
- Fixed a bug that made unbootable psp without memory stick or with a bad one.
Source: [...]

Dark Alex has released PSP Custom Firmware 5.00 M33-4. CFW 5.00 M33-4 brings various bug fixes as well as a new shut down option from the VSH menu. Great for quickly turning off your PSP.
Changes:
- Speed selected for umd/iso was not properly locked in some new games that used scePower_EBD177D6 instead of scePowerSetClockFrequency to change [...]

Quick to fix the introduced bug in M33-2 DAX has released 5.00 M33-3!
* A bug was introduced in 5.00 M33-2 that made some games and homebrew to not work.
* PSN version check is now automatically bypassed without the need of touching any settings.

Word has it DAX is aware of the bugs present in 5.00 M33-2 and we can expect to see a release asap of 5.00 M33-3. This relates to the PSP Store bug which is still present and ISO / UMD troubles some are having. The update will also include a PSP store bypass plugin.
Thanks for [...]

Dark_Alex has released custom firmware 5.00 M33-2, this is a bug fix release which fixes bugs found in the previous 5.00 M33 release. The changelog is below:
* Popcorn bug fixes
* Fixed bug that caused some games with certain icons not to work, and caused document.dat not to work.
* Fixed critical bug that caused continous corruption [...]

DJB has updated his mulifunction MMS maker to version 2.4.
Changes:
v2.4 (2008-10-22)
- Fixed installation bug with NetConfBackup.
- Added the 5.00 M33 CFW Installer + 1.50 Addon.
- Updated the following Support Tools:
Hellcat’s Recovery Flasher 1.40 (Pandora)
FuSa SD 1.0.47 (XMB (5.00 M33 Compatible))
The brand new 5.00 M33 Custom Firmware Installer has been included in this package, it can [...]

Hellcat has updated the ever useful recovery flasher to version 1.40.
The version brings about the ability to flash to 5.00 M33. Here’are the other changes:

Added native support for installing a fresh 5.00-M33
Added option to cache the special modules from all updater .PBP currently on your memstick.

The modules are saved seperately and – if present – [...]

Dark_AleX has released his 1.50 kernel add-on for older PSP “fat” units (PSP-1000’s) that are running 5.00 M33. This update allows PSP fat users to run older 1.50 kernel homebrew.
For this update you’ll need to download firmware 1.50 which can be found here
Source: Dark_AleX

Dark_AleX has been busy today, with 5.00 M33 released he now brings us an updated PSPStates plug-in which now supports 5.00 M33. As the name suggests PSP states is a PSP save state plug-in that brings save state support to your PSP Slim 5.00 M33. Only the PSP Slim is supported as it has the [...]

Dark_Alex has posted a solution to users who are experiencing error 0xFFFFFFFF while trying to load PSX games.
This is a bug in M33 code that is caused sometimes with certain icons.
I’m not gonna bother do an update only for this but I’ll post the file that fixes this for anyone wanting to fix it manually [...]

Its only been a few days and Dark_AleX has released Custom Firmware 5.00 M33 at lightning speed.
Apart from the obvious firmware number change (see below), this update comes with a bug fix.
Dark_AleX:
Bug fix: when changing speed in xmb, and the psp turned the brightness to 0 automatically the speed was reseted to 222 again.
The readme [...]

PSP Custom Firmware (CFW)

Please select desired M33 Custom firmware version below:

PSP Custom Firmware 3.60 M33
PSP Custom Firmware 3.71 M33
PSP Custom Firmware 3.71 M33-2
PSP Custom Firmware 3.71 M33-4
PSP Custom Firmware 3.80 M33
PSP Custom Firmware 3.80 M33-2
PSP Custom Firmware 3.80 M33-4
3.80 M33 Popsloader
3.80 M33 Popsloader V2
PSP Custom Firmware 3.90 M33
3.90 M33 1.50 Kernel add-on (PSP Fat)
3.90 [...]