How to get CFW 3.4 oe-a to m33 3.71?

I have looked around and am still not sure how to get my PSP from 3.4 oe-a to m33 3.71 i did find a guide here:
As for the installation procedures, a step by step guided is provided:
First method for both psp, the preferred when possible:

* Requeriments: a fat psp slim with 3.52 M33-3 or 3.52 M33-4. Previous versions of M33 won't work, due to a bug that affects them and OE; or a psp slim with 3.60 M33.
* Copy the UPDATE directory into /PSP/GAME/UPDATE and copy the EBOOT.PBP of the 3.71 Sony updater there but with name "371.PBP". Note: the program will not even show if you copy it to a different folder than that.
* If you are in the fat psp, make sure you have configured the psp to run the game folder in the 3.XX kernel.
* Press X, and the Sony updater will begin. Sit and enjoy while Sony code installs 3.71 M33
* When finished, the updater will ask you to reboot (pressing X or O). DO IT. Do not skip this step as shutting down the psp by yourself will end with a brick.
* You should be now in 3.71 M33

At the moment i am not sure how to do this and looking for ideas/sugestions.:confused: :confused: :confused: :confused: :confused: