A PSP Fat I was given yesterday does not recognize the official PSP-290 GPS receiver!And not only with MapThis!,but with Go!Explore as well!Both the GPS and the PSP's USB port are working correctly(tested USB Camera).I tried ChillyWilly's Key Cleaner,it didn't work.I tried to change the files usbacc.prx and usbgps.prx from Flash0 with these from other firmwares-no.What am I doing wrong?It's obvious it is nothing hardware-related.Please help!