What exactly is going wrong when you try to write? Is any API failing? If so, could you infer anything from the return type? Please contact the Tech Support if you need assistance.
Hey Marko...upload your code. Maybe then will be able to find error.
sorry on delayed response. Ive bee quite busy on EW2016 in NUE. Over there i met your colleagues and showed them issue, we agreed that I need first to get in hands the 4.2 module and we will escalate issue on your SR. Once we get solution i will post it here for the sake of all people on forum.