Do you have usbgps.prx and usbacc.prx in your Map This folder and if yes, what version?
In what folder do you have Map This and try changing your kernel in the recovery menu.
What motherboard do you have? TA-082 and TA-086 may have some problems with registry keys (or something like that, don't know exactly), there should a key cleaner (chilly willis, if I remember right)
TA-082 and 086 motherboards have IC1003 written on them (open the umd drive, then look from the back, in the upper-right corner should be written smallely IC1003 (reversed) if it is a TA-082 or 086
Edit: http://www.dcemu.co.uk/vbulletin/sho...1440&highlight look this topic and from the first post Downgraded a TA-082 PSP and and your PSP290 device doesn't work?
Try this , it has helped others in the same situation.
Then there are some files to download, maybe this helps
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