@tenspot No problem! :) It was likely that you had a very old version of the firmware tool installed!

@robert-hh Thanks for all help check my last post :)

@jeromemaquoi really better if you show some sample what do. As you can read here detail was provided by chat but better is write on the forum and ask question with sample and exact error message.

Hey @livius, that did the trick, again! Thx a lot, that makes even easier the deployment process, and i´ve also learned pretty nice stuff in the meanwhile. By the way, i first tried to make it work by cloning the project 'master' branch, but that code wasn´t making the deal yet. To make things work i had to clone the 'devel' branch (that by the way it´s weird because it´s one version behind 0.9.3 than master 0.9.4). Thx a lot again man, saved my life!

@jmarcelino [Solved ] Resolved, used a different power supply unit and it worked. I guess even though I was getting enough juice of 3.3VDC out of the Expansion board with a LoPy current was not enough. Thanks much!

solved. The problems i had has been level shifter dependend. I used another one and UART started to work. Another trap has been a misunderstanding in PIN numbering and PIN layout. When i just looked at WiPy pinout without paying attention to expansion board i noticed, that i used the wrong PINs. Now i count from left side, starting with 0 and figured out which PINs i do have to use. Now it works like a charm. Thanks for all your help !