So in the year 2016 I want to go online with my PSP, well, access PSN. Based on the info from nz17 if I upgrade to 6.60 OFW it should be ok? I'm presently on 5.50 Gen-D3 and I was getting the old 80431075 error and was unable to link the DLC content for Gran Turismo PSP. My understanding was that you cannot bounce around firmwares, although its been a while since I last did it.
I probably last went online 3 years ago, perhaps more, but its just to sign in and authorize that the accounts are the same as there is no other way to use the 5 DLC cars that for some reason are still on PSN, hence why upon recently finding GT PSP I decided to get them.