Hello, We are sorry that our sales did not reply you ASAP. next time if you do not get the answer in time, you can email me here and i will do my best to answer you.
For your question, i tried to explain in English.
Measurement duration = memory depth/sampling frequency.
our tbook mini is 14 grids.
so 4ms/div=28M/(500M S/s*14div)
our scope uses 1 -2-5 steps, but when they are in special time base, it is not 1-2-5. some scopes uses same way.
all firmware versions are same.
However, thanks for your remind, I told our IT team to update the newest firmware soon.
As I know, they are testing automotive functions right now, but it is not ready to be released. so they do not update the firmware in our server system. if someone want to test free automotive(PS, it is not perfect right now), you can contact me here to get the free license. but i do not promise it works to all customers.