squish

I just recently purchased a Sony 2gb Pro Duo, only to find out that it would not accomodate atrac3plus, doing more research I found out that it would if you updated your psp to v2.0 or higher(I just updated to v2.6) and then download sonic stage v3.2 or higher, everything works with my 32MB Duo but when I put the Pro Duo in, its just not working. I on't know if I'm missing a step or what, can anyone help me.