@ryg Hi Ryg, Thanks for your message. The story started there when the main deco started to turn solid red. I swaped the tow unit, so the satellite became the main one. Whatever I did, it kept solid...

@ryg Hi, I've updaated manually following the instructions here: https://community.tp-link.com/en/home/forum/topic/793908. Choose Method 2. Good luck!

@David-TP What debug firmware David?

@David-TP Hi David, For the third(!) attempt the retailer managed to reset the guilty unit (all in all, it was the 20th attempt that was successful!), so finally no replacement was needed. Currently...

@David-TP Hi David, This morning I proceeded as suggested. "before making any reset or restart, I hope you can connect a laptop to the satellite M4 via an Ethernet cable, then access...

@David-TP David, as As said previously the satellite unit starts with solid green and after one minutes turns to solid red. Not possible to connect is neither with cable, neither via wifi. This...