Home Internet Gateway WiFi Channel

I have the T-Mobile Home Internet Gateway (aka 5G Gateway) based on the Sagemcom chipset.

Model: Sagemcom FAST5688W

Firmware: SGJi10205-1.2.B4

It keeps selecting the most congested WiFi channel in our condo, it’s very strange.

Can I use the “Nater-Tater” config file approach ( https://www.youtube.com/watch?v=8s3ZhGYEl2I ) to change the WiFi config, similar to the  Arcadyan KVD21 that Nate uses?

Thank you in advance.