Hello, I currently have a CFW 3.71 psp and have been having alot of problems with the square button sticking really bad. I know that this is a common problem but I am wondering what I should do. I bought the unit in Dec of 2005 at "Best Buy" along with a 2 year replacement plan so its fully exchangeable. My question is, if I retrun it, will the new psp be undowngradeable? What firmware are they current PSP's shipping with? I think that 3.50 is the highest firmware you can go using the Lumines downgrader. Also, are most stores only stocking the "slim" model at this time which cant be downgraded to 1.50? Thanks for you help.