2.4 ghz not showing

Thursday night / Friday morning T-Mobile did some kind of firmware push to my 5g home router and it knocked out everything 2.4 gig on my network. Office equipment and VOiP devices are all not working because they require 2.4g. T-Mobile, please correct what was broke. I hate the cable company. But, it looks like it’s back to them after the next day or two if nothing improves.

Already did all of that. The TMobile router will no longer advertise anything 2.4G. 

I was able to remove Thursday night’s fw push and the router resumed normal operations. Called ATT to have them provide internet. I cannot afford any service interruption again. That would end my career. 

Me too, same time, so must be a firmware issue.

How do you rollback a firmware update?

FWIW:A day later and a 2.4 ghz signal is still not being advertised (after reboot, etc).  I could not find a direct solution, I didn’t have the time to phone in (and shouldn’t have to), but I did have a spare router. So I set up the spare router as an access point, for wifi only (Obviously, I shouldn’t have to do this (but judging from other posts on this forum over the years, this issue keep re-occuring with different firmware updates))..

I contacted TMobile and did a factory reset of the modem and re-installed everything.  So far, so good.

But I do not understand it, and I do not understand if this will happen again.  it was a complete pain the bottom to do this

Also, one other thing when it came back up after re-set everything was trying to set to WPA3 for security.  A lot of devices can’t work with WPA3, so set it to WPA2 and it works fine.