My new Blue Door/Window tells me that it wants to install a new firmware. I tell it to do that, a progress bar appears and it seems to downlaod and install. After the device comes back and I press the button and check for new firmware, it tells me that it wants to install a new firmware. And I can repeat those steps untill eternity (or the battery gets emptied.
What to do? 
Please use the Shelly Debug App for the update.
Ik have 5 Blu door window sensors. Only 1 of them can be Updated via Shelly debug App. The other 4 don't update.
One was saying 'update succesfull ', but in the Shelly smart app it shows it still has tot update. So update was 't succesfull?
There are 3 Shelly d/w I cannot update via debug app.
What am in Doing wrong?
Remove the Batterie for about ten minutes.
Start the Shelly Debug App
Press the button and hold it while putting in the batterie.
Release Button and press it once. Now you should be able to connect by Debug App and force update.
thx. I'll try it tomorrow!
