This is the New Custom Firmware (CFW) 6.60ME. This is for PSP 1000 and 2000 hackable models only. No Light (CFW) [LCFW] yet but will come soon.
So i kinda got messed up in this video cause the Readme.txt was messed up so i fixed the files for you so you'll have no trouble :)
After downloading the CFW files if you open it or extract them you will see the release folder for 6.60ME, open that and you should see an UPDATE folder and a leda folder. Take the UPDATE folder and place it in the ms0:/PSP/GAME folder on the PSP Memory Stick (MS). Once you have done that take the leda folder in the downloaded files and open it and you should see a game.txt and the leda.prx. On the Root of the PSP MS make, if you haven't already, an seplugins folder al in lowercase letters and open it and copy the game.txt and the leda.prx from the downloaded files into this folder and make sure the game.txt has this written in it "ms0:/seplugins/leda.prx 1" (NO QUOTES).
If you have had ME CFW before be sure that you replace th leda.prx with the new one.