Your psp is an unhackable model, so forget about M33 or any full cfw. You'll need LCFW.
PSP Custom Firmware 6.39 ME-9, PSP Hacks - PSP Slim Hacks
as i understand, the above link gives you the option to install LME-9, which is compatible with the psp 3k. Personally, i haven't seen an installer that installs both hackable cfw and Lcfw, so watch closely for the instructions, since if you try to install a hackable cfw on it, you'll brick the psp and that model can't be unbricked unless sent to sony.