Okay, like many of you may know, DC6 comes with the 'Test M33'-option.
Then Niko86 figured out that you can launch 4.01 M33 if you replace the resurrection.prx with ELF Tool resurrection.elf file inside the DC6/kd/ folder, although if you do this you can no longer use DC6.
So I patched the four files (IPL.BIN, IPL_01G.BIN, IPL_02G.BIN and TMCTRL401.BIN) to load from /TM/401/ .
You need to create a copy of the 'DC6' folder and rename it to '401'. Then place these four files inside /TM/401/ and addto your config.iniCode:
SOME_BUTTON = "/TM/401/ipl.bin/";
Then just hold the button down and boot your PSP. And you're running 4.01 M33 via TimeMachine from memory stick!
Also, if you want to use M33 Driver, you need to set it in 4.01 M33 MS recovery and also in 4.01 M33 MS VSH recovery for some reason. EBOOT loading works fine, but I have only tested a few games.
IMPORTANT: If this doesn't work for you, make sure you have all plugins disabled, especially CXMB. Looks like if you have CXMB enabled, you'll only get a black screen when launching 4.01 M33 from MS. This has probably something to do with the fact that both TM and CXMB load theme files among other files from the mem stick. I'm tryin to fix this right now, any help would be appreciated. I have got the recovery to save the enabled/disabled config in a different file, now I just need to know what PRX handles the plugin loading during start-up.