@arduino So I had to use the flasher CLI, which downloaded "the latest" image and flashed it.
Latest in this case means: When you connect with AppLab the first time it ALSO downloads a bunch of updates and you have to wait ages for the board to be usable again.
Naturally all data is gone, even from the "/home" partition.
Why the heck does it waste HDD space by splitting the disk into "/" and "/home" and then does not preserve "/home"when re-flashing?