So it seems after lots of mails back and forth that the problem came from a messy update policy at Carpuride. First they had OTA updates, which they then switched off themselves without notifying anyone. Then you had to download updates, but only for PC and on a flash drive. In my audiovisual profession no one has PC's, so there you go. After complaining, they suddenly turned OTA on and I could update the device. By then I had finally found someone with a PC, so I could also do the firmware update with the SD-card. Now everything is updated and for the moment works fine! Welcome to the 21st century...
