This is a new Custom Firmware (CFW) that came out for PSP 1000 and 2000 models and this is how to install CFW 6.39ME-9.2 This firmware fixes a couple bugs and also adds a few more things.
Take the file that i have for download and extract the files to your destop and open them. take the UPDATE folder and place it in the ms0:/PSP/GAME folder and then take the leda folder and open it and if not already, create a folder called seplugins on the memory stick (MS) root of the PSP and open it. then place the leda.prx file inside the seplugins folder. after that create a new txt document called GAME.txt and inside type "ms0:/seplugins/leda.prx 1" (no quotes) and then exit and save.
once all thats done, exit USB mode and then run the installer under game and your done.
NOTE: ONLY FOR PSP 1000 AND 2000 MODELS ONLY WORKS ON 6.39 CFW (NOT SIGNED)