Updating DSO Nano V2

Hi I have an old DSO Nano V2 I had laying around for a long time now. I turn it on in DFU mode and it says DS0201 Device Firmware upgrade Ver 2.0 .

On regularly it says lib 2.22 and app 2.40.

I see there is a version 4? Is that just for the v3 model?

If there is an upgrade, is there an easy tutorial to follow?

EDIT: I have found Dfuse Demo. I have a copy of BenF Firmware. App v3.64 and Lib v3.53. Not sure if these are the latest? Do I flash internal flash or spi? Both, which dfu to which?