An update from the legendary Dark_AleX for his custom firmware, 3.71 M33, named 3.71 M33-2, was just recently released on DAX' website, and so was an update for the 1.50 kernel addon, which allows for 1.50 homebrew to be used on 3.71 M33 (only for PSP fat). They contain a number of fixes listed here:
3.71 M33-2 changelog:
- There was a bug that caused corruption when writing files of more than 32256 bytes using usb flash.
The bug has been corrected, and now the implementation is as reliable as it was when it was based on 1.50 kernel.
(tested with a full restauration of a dump)
- Psp Slim: a functionality to let the charge of battery when connecting a usb cable has been added.
This feature is based on Noobz plugin code.
By default is not enabled, you can enable it in recovery.
Note that the charge of battery may be delayed some seconds since the moment you plug the cable.
- After installing this update, program at /PSP/GAME/UPDATE will always be executed on 3.71 kernel, despite configuration.
- VSHMenu: vshmenu will not be executed when onscreen keyboard is active, to avoid the lost of
the select button function in the keyboard.
An option to reset the psp has been added.
Note about twi bugs remaining:
The WLAN network error, and the PSP Slim psx game change of brightness.
These two bugs are copyright of Sony
happens too in OFW.
The WLAN network happens when there is no network available, so not a big problem.
The bug has been corrected, and now the implementation is as reliable as it was when it was based on 1.50 kernel.
(tested with a full restauration of a dump)
- Psp Slim: a functionality to let the charge of battery when connecting a usb cable has been added.
This feature is based on Noobz plugin code.
By default is not enabled, you can enable it in recovery.
Note that the charge of battery may be delayed some seconds since the moment you plug the cable.
- After installing this update, program at /PSP/GAME/UPDATE will always be executed on 3.71 kernel, despite configuration.
- VSHMenu: vshmenu will not be executed when onscreen keyboard is active, to avoid the lost of
the select button function in the keyboard.
An option to reset the psp has been added.
Note about twi bugs remaining:
The WLAN network error, and the PSP Slim psx game change of brightness.
These two bugs are copyright of Sony

The WLAN network happens when there is no network available, so not a big problem.
1.50 kernel addon v2 changelog:
- When returning from sleep mode, 3.71 ipl was executed causing an inmediate crash. Fixed.
- vsh plugins were being executed on recovery too Fixed
- vsh plugins were being executed on recovery too Fixed
It is important that you read the full readme for installation instructions!
Original custom firmware 3.71 M33 - needed before installation of these patches
Download and comment!