I just wanted to say thank you - this has worked for me.Welcome to the forums @KoubaDZ.
If you didn't do a full reset to factory defaults after flashing the firmware you are currently using, you have done things in the wrong order.
You may want to do a full reset to factory defaults now, and then minimally and manually configure the router to secure it and connect to your ISP.
This is the best way to get the router/network to a good/known state before you start any serious troubleshooting.
I did do that once when it hung other than that the dirty update that most use round here. Switching on and off whilst sinking runs a risk I concluded from that event, so then a factory reset and re pairing. Reckon those stuck ones reported had that.I just wanted to say thank you - this has worked for me.
Still looking good? It sounds like my setup (and problems) are similar to yours. Wired backhaul, nodes flashing red….Beta has now been solid for me for several days.
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