Bbshd/sw102 voltage change

[Torqu-E-Cycles]

I have a bbshd 52v with sw102 display, I am running a 48v battery and want to change the display so the battery indicates correctly, any ideas? Nothing in display settings and nothing in bafang config tool... what about flashing neilson firmware or buying an eggrider? I want to stick to a really small display. Or do I have to buy a 48v controller?

Thanks all!