i'm having the same exact problem with the psp 290 - mapthis! shows gps state is off, green proggie shows all 0 values. i've tried having it on outside for 10 minutes. i'm using the prx files that came with the green proggie, in the mapviewer and camprx folders. i'm running 3.03 OE-C set to kernel 3.03.
i've scoured these forums for answers, and so far no suggestions have worked. i read one suggestion about a usbhostfs fix, and though i searched on google i couldn't find info on a "fix" anywhere. that would be something i'd be interesting in trying.
i traded my foolishly-updated brand new psp for a used one just so i could downgrade to get the OE, and bought a psp 290 from play-asia, all so i could use densika's mapthis! gps program. needless to say i'm so far very disappointed. any help would be greatly appreciated.
[EDIT]: perhaps i should add that i am *not* running on a TA-082 MB.