I'm curious as to what a signed pspident has to say about it's mobo. IIRC the 09g or was it 11g was the street(?)
And the street IS the E-1000 it was critiziced because they went back down to 1000 model number and being a budget version back in '09/'10/'11 before the vita/psp2 was unvelied.
If it does turn out to be hackable go for the light custom firmware options like pro/L-ME and stay away from infinity until proved safe. Don't risk the console for a coldboot.
Are you really sure it has no wifi/wireless capabilities at all? Antenna gain sounds like a more powerful signal output device. But if it lacks wifi what does it do? It doesn't seem to have BT either.