Still fails even after full cal on both channels. Did also fail right out of the box. Probably doesnt mean much, as everything works so far.
As for the newer firmware, it seems to be somewhat more stable, expect for the one time it rebooted at my first cal attempt, i didnt witness any crash yet.
Oh, and now for some bad news: The whole thing is seriously dangerous.
The power supply is constructed with totally inadequate isolation between primary and secondary, and the secondary side is NOT grounded. So in case the isolation fails, the outputs will be live.
Why? Have a look at the transformer, trough the slits at the top of the bobbin. Primary and secondary windiwngs are made with normal magnet wire (approved TIW looks different), with no margins on both sides of the bobbin and only one layer of thin tape in between. As the secondary is not grounded, it would have to fulfill reinforced isolation, ie 3kV proof voltage, and (depending on material group, PD and installation category) at least around 5mm of creepage distance, and 3 layers of tape. What it has is pretty much ZERO creepage. From my experience, crap like this break down with <2kV, often less than 1kV when hot. Spikes of that magnitude are not uncommon, especially on 230V mains.
Also, the isolation is crossed by a 4.7nF "Y1" capacitor that looks too small for its ratings. Looks more like a Y2 from the ceramic thickness.
Apart from that questionable part, this capacitor results in the non-grounded outputs having significant voltage (and quite some peak current when shorted) to ground, which can kill whatever circuit it is connected to (and you can even feel it).
At least, the secondary common needs to be solidly grounded to improve safety for now, but Hantek really has something to explain as they stuck a CE mark on a non-compliant device.