Custom Firmware 5.50 GEN-B2 has been released by the PSPGen team. This release is a bug fix release that fixes a compatibility issue with Despertar del Cementerio. You need to be on Custom Firmware 5.50 GEN-B in order to taken advantage of this update.
Custom Firmware 5.50 GEN-B2 Changelog:

Fixed bug that prevented the launch of an [...]

Xenogears and Becus25 have been busy, releasing their own 5.50 Custom firmware for the masses called Custom Firmware 5.50 MHU. While I’m not sure of the changes in this new CFW vs 5.50 GEN-A. If you have some free time why not give it a go and report the changes to us? Note this is [...]

Custom Firmware Enabler is back with another tweak + bugfix as Xenogears and becus25 have released CFWEnabler 3.51. The changes are minimal, but if your running CFWEnabler over Custom Firmware 5.03 GEN-A then it would be wise to update. As the update server has changed so its important for future updates via your XMB.
Custom Firmware [...]

GENyUS and the PSPGen crew have just released PSP Custom Firmware 5.50 GEN-B. Note this is for PSP-1000 and PSP-2000’s TA088v2 or less motherboards only. Not for PSP-3000’s or TA088v3> PSP-2000’s. 5.50 GEN-B introduces a few minor changes. There is now a Pandora battery maker in the VSH. (You can make your battery a Pandora [...]

PSPGen have just posted that their Custom Firmware 5.50 GEN-B has been delayed up to 24 hours from release due to the discovery of a few minor bugs in the final moments before its release. Apparently pressing select for the VSH or recovery menu, nothing happening… So a minor sent back. 5.50 GEN-B should be [...]

Custom Firmware 5.50 GEN-B is on the way. This update from the PSPGen crew will introduce a few minor changes, firstly you will be able to make your battery a Pandora Battery or back to a normal battery right from the VSH Menu. of course this is on supported PSP models that you can make [...]

First the Anti-Custom Firmware game Evangelion: Jo, now this. As Sony has blocked Playstation Store access from M33 Custom Firmware. If you try to login to the PSN Store you’ll get this prompt
“A system software update for the PSP system is required. For update methods, refer to the instructions for the PSP system.”
And no, not [...]

PSPGen have posted that a new Japanese game, called Evangelion: Jo scans your RAM and detects if you have any type of custom firmware or not. If it detects you have custom firmware. The game will freeze displaying the screen above with some lovely classical musicplayed in the background. It also doesn’t seem that you [...]

EDIT: CFW 5.03 GEN-A is out !!, now that didn’t take long did it. Get it here.
PSPGen have posted a FAQ for their soon to be released Custom Firmware 5.03 GEN-A for Hen, which by the way was meant to be released about an hour ago…. I guess we will see it today? (6th of [...]

Same guys over at french site PSP Gen are working on there own custom firmware – 3.95 GEN. Its still being tested. And there is a major drawback, the PSOne emulator doesn’t work on the PSP Fat. Its possible its due to hardware or memory limitations on the PSP-1000’s. The only change I can see [...]

Intrested in having 3.93 firmware on you PSP but still want to have custom firmware, well hombrew devolper Yellow_Rain over at QJ.net has made a patch to add the new functions of 3.93 official firmware to 3.90 M33-2. The patch works for both PSP Slims and Phats. Know that this is not a new firmware [...]

Custom Firmware 3.90 M33-3 Released! DAX has released a small update to 3.90 M33. Improving the compatibility of the M33 no-umd driver. This can be downloaded and updated from your PSP, using the Network Update feature. Or use the download link below.
* March33 NO-UMD driver compatibility has increased to support games like Coded Arms, Patapon, [...]

Dark~Alex has just released his new firmware: 3.90 M33-2! Here’s the changelog:
Changes:
– Improvements in plugins loading code:
* Fixed some problems with problematic cards due to filesystem not mounted.
* Now plugins should read the faster.
* Problem fixed with lines with spaces at the end.
- Added the rest of regions to the recovery option [...]

Dark_AleX has released an update to his 3.90 M33, 1.50 kernel add-on for Fat PSPs. This update now supports memory sticks greater than 4GB in size running the 1.5 kernel and also this fixes a display bug that affected TA-86 motherboards.

Installation: Copy the “150k_installer” folder to GAME and run the installer from the PSP XMB [...]

Dark_AleX has released PSP Custom Firmware 3.90 M33 to the world. This new firmware bring a major feature on board, Skype for the PSP. Finally its here. (Confirmed this works well, Skype calls sound just as good as on the PC)
Instructions
- Copy the UPDATE folder into /PSP/GAME/
- Get the 3.90 sony update from somewhere, and [...]

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 [...]

Please select below:

Official Sony Firmware
Custom M33 Firmware (5.00 M33 etc)

_HellDashX_ Custom Firmware (3.72 HX)
Custom Firmware Enabler (CFW for PSP-2000 TA-088v3+ & PSP-3000’s)

GEN Custom Firmware (PSP-2000 & PSP-3000 – TA-080v3+ motherboards)