I have mulitple TP Link Mesh Routers working at different locations.

On December 2nd, 2023 at approximately 4pm PST, All of them stopped working with a hard red led.

I tried factory resetting them to no avail.  I can set up the routers (flashing blue LED, but they will turn solid red since they do not receive a connection from the modem)  I ended up using a 10-year old Linksys router to use with my Cable modem and it (unsurprisingly) worked.

I spent the next couple days trying it again at a different location with different modem.  No luck.

I then decided to hook up the mesh routers, via AP mode, to the Linksys router.  Finally it started working and it's been a while since I got the solid green LED.

I got a firmware update notification.  I updated the firmware quickly.

This then got me to think.  I changed back the mesh router back to WiFi-Router mode + reset it and re-attached my modem to it.

Surprisingly, this time it worked.  I am now resetting all of my mesh routers into AP mode, so I can do the FW update.

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TP Link Company --  you should not be disabling your routers due to old firmware.  What terrible practice.  I'm glad my 10-year old Linksys is still working.  

My next mesh router company will not be TP Link, (or Asus for that matter)