New DSO201 owner with basic questions

I just bought a DSO201 'scope and I’m trying to figure out exactly what versio I have and how to bring it to the latest revision.

It appears to be a V1, except that the R/S button is an arrow/double bar >||
Power up says Ver 1.5.20p
The probe is a X1 / X10 switchable

I understood when I bought it that this was the latest version, is that true?

Also, it came with NO instructions. Can someone point me to a good e-reference please?

And lastly, I see a lot of references here about flashing firmware. Is there a tutorial on doing that?

Thanks a lot.