To answer a lot of questions, YES this guide works. However, it needs a little clarification. The last step asks you to get the fat files from the internet (with a handy link from Mexi_chino.. ty btw Mexi

) The files you want are under the "Despertar v3" folder. Copy everything in that folder to the root of your memstick. This guide seems to have some redundant steps but if your goal is to install 3.71 m33 on a slim they won't hurt anything. Overall a good guide. Also I have a wierd question.
I already added a cfw to my psp slim (version 2001pb) via a Datel tool battery and a magic memory stick (from this guide). When I first loaded it to service mode with the battery it showed EVERYTHING on the screen with no problem. All there! Every step displayed without a hitch. Now here is my question... why did it show for me with no problems while every guide I've seen says I shouldn't see it on a slim?