@T5-T6-Schnappi Thanks for explaining programming mode I already thought something was wrong again😀 .
My internet might be not the fastest, but I am sure connection is stable.
I use not so powerfull charger as yours( mine "OSRAM" provides 8Amps), but I checked voltage during software reading and it was stable 12,7V. Vdash states it needs to be at least 12,6V so I guess Im still good with it.
Adapter I use is from china some DICE clone i got for 50Eur. Name in Vdash is "SM2 USB". Tried to download drivers from Vdash site, but then device is not recognised. So I used chinese seller's provided Scanmatic drivers.
As I understand it, the problem is most likely with the adapter, I think I need to buy a super j2534 from vdash. Is it possible that they will refund the credits for this failed operation if I used the SM2 adapter?