@David-TP Thank you for the answer. After trying your suggestions the problem wasn't solved. I contacted the seller and they are sending me a new M4 for free. Good to know this forum works great if...

@ImtiazAli Thank you for the reply. However the link to first page doesn't apply, because the bricked deco is seen as offline. So updating through the WEBui can't be done. The 2nd link does apply,...

After the latest update 1 of my 3 M4-units is offline. A yellow light is turned on. When I follow the instructions to manually update it with the latest firmware I'm not able to enter recovery mode....