I have one more question.
In the new multimeter firmware is 1.01.01.16. On the Siglent website current firmware is 1.01.01.16R2 - Is it maybe the same firmware?
According to the "SDM3055 Firmware Revise History & Update Instructions" I should install the Vp15R2-to-p16-transition.ADS first.
What should I do?
In mine (just checked) Utility>System Setup>System Info shows 16R2.
I check the websites and my local files too and there is no just 16.
It may be a factory version, I do not know.
As it seems to be later than 15R2, I do not think you need to use the Transition file but it will do no harm to use it.