DSO Quad engineering sample bug and firmware upgration

[ESP]

@jpd

Will these problems be fixed in the beta-test batch? I’m not bothered about firmware issues - they can always be addressed later, but the input voltage limit will be a problem for me.
(I don’t want to buy something that could get fried measuring 15-30v signals. I’d rather wait and pay a bit more for the production run.)

The problems will be fixed for beta batch. Thanks!