Nuki Opener - Stoped working

Hi, my N Opener stoped working.
FW 1.10 / current 1.4 (I know It’s old and have to update it…but I can’t)

  • Was working 2 years / now out of warranty
  • new batteries - no succes
  • powered by usb / Powerbank without batteries - no success
  • Wires to the intercom bus are removed - no success

Synthoms:

  • After a reboot , 20 sec later the bluetooth connection ist lost the bridge

Anyone an idea to solve or troubleshot this issue?

BR Chris