Official update to 1.32 worked for me as well. Beside the 100x option, there seem to be no visible news in the menu. Not 100% sure, but the AUTO function seems to make better choices with offsets and sensitivity when using 1 channel vs 2 channel. The vpp,min,max measurements give readings that do not depend on the vertical offset anymore. RMS though does change with the vertical offset. Still, the measurements are off by a lot for spiky signals like pulses with a low rep rate. It looks as only a fraction of the displayed data is used for the measurements and thus the peaks while visible might get thrown out of the analysis.
Some info on what's new in Firmware 1.3.2 (by Tim - who left Zoyi):
1, Fix the inaccurate duty cycle measurement.
2, Add probe attenuation of X100.
3,Add voltage amplitude calibration, and include amplitude calibration test in the manufacturing process.
Source: comment section of this video:
PS: Some time ago on this forum thread there was some speculation about the trustworthiness of firmware updates from various sources and the conclusion was more or less that the Zotek official Google Drive is the best. Now it's fun to see how untrustful are the members of the dt380.com Chinese forum with the zotektools.com website. As I learned on the forum they're getting the firmware updates directly from Zotek support in mail which they post/share in the forum. For them that's the only reliable source, and not the English Zotek site...