When I got up this morning, I noticed some of my devices had no internet but some did. The only devices connecting successfully were on the 2.4GHz band; not even wired devices worked.  Powercycled router - no change; powercycled both modem and router - no change.  Completely reset the main router and unplugged the satellite - no change (besides losing ALL of my settings and device info of course, thanks to a backup option that doesn't work).

So I called tech support.  Good grief.  That poor guy with his checklist was useless.  He "moved me up" and said he was sending me an email with further instructions.  I received the test email before we hung up but no other email was sent.  Thanks.

I expected it was a hardware issue since I wasn't aware of a recent firmware update.  I reset my satellite and set it up as the main router.  It had the exact same issue so that ruled out hardware.

I forced my laptop to use 2.4 only, downloaded the previous firmware version (Deco BE63(US)_V2.6_1.2.0 Build 20250718) and connected to the router via browser since the app doesn't do rollbacks.  Once the old firmware was installed, everything is back to working properly, except wired.  It's so dumb but out of all of the connections, wired no longer works.  I unplugged the TV and Apple TV ethernet cables from the router and then I lost internet entirely.  Mind you, I didn't touch the ethernet cable coming from the modem.  I unplugged it and plugged it back in...nothing.  I had to reboot the router with only the modem ethernet plugged in to get back online.  The other ethernet ports still don't work but at least I have wifi, I guess.

Any explanations as to how this happened?  Anyone else have this issue?