PSP 5.01 version, upgrade help needed

I have a PSP that is running the 5.01 software.I have bought and charged my pandora battery and have an 8gb memory stick.I have downloaded 4.01 eboot and PSP Grader v006 - Lite setup, and several games.Now in what order do I continue to make this all work ????When I run the PSP Grader and put the 5 files onto my memory stick, and insert the memory stick and pandora battery...nothing happens...just the little green light comes on. What am I doing wrong ?HELP.....

Is this a PSP-1000 series? (phat) or is it a 2000? (slim)

Slim, bought at last Xmas (2007) for my 7 year old son. Just got sick of paying £30 for each game!!!! It was only updated last month (November) when I realised it could connect to my wireless house system.It seems that everyone is getting me to re-load 4.01 (eboot - whatever that is!) using the PSP Grader. I have got so far and just hit a brick wall of what to do next...everyone keeps replying that it is easy just do this, this and this... but it doesn't seem to work for my PSP.ARGHHHhhhhh.....

I'll send you a PM about something.