Thank you for your reply.
Tried everything, still can’t get it working.
First connecting type C USB, first connecting power supply, waiting 10min first boot before connecting HDMI, really everything. With both bios version 193 and 1J2. Even re-done exactly like in the video tutorial. Did it with two different Joule board (we got three of them), same thing.
Flashing is always fine, but can’t get that output working.
Anyone with an other idea ? (Hardware is fine, test moves worked)