There's a bug with Handy's OTA server. The latest firmware update is 3.2.2, but some users aren't able to update by going to the Handy website, and the Handy API is incorrectly reporting that the update is required, rather than just available. The Handy devs are working on a fix.

In the meantime, you can try using safemode to force the update.

- Create and start a hotspot on your phone (name: safemode, password: recovery)

- Unpower your Handy

- Wait 30 sec

- Power your Handy in safemode (Hold in the wifi button, then power your Handy. You can release the wifi button once your Handy is blinking yellow).

- Wait 15 sec

- Press UP button until the light changes

- Your Handy will now try to update

- If it blinks red, wait 10 sec, then press the UP button again. Repeat

Thank you so much for the fast and good support even with extern devices! it worked! 

And my sincere apologies that I suspected the bug on your side first, wont do that again! :)