I translated HM33's post at pspx.ru, and I think I found details on M33-3
What is new (c Northern mostly) :
Recovery Menu :
- added processor speed-75 and 133
- added access to flash2 and flash3
- added "vshmenu", which can be sdampit UMD to a computer.
added support UMD VIDEO images using vshmenu Selection (!)
And added support in popsloader 3.30.