I can see only the 2.4 ghz and 5ghz-2 channel on devices. I bought this modem around Sept 2019

Hello, Please help anyone if you can. 5ghz-1 does not show on my devices. All the wifi lights are on. 2.4 and 5ghz-2 shows up on devices, but 5ghz-1 does not. I have restarted and done a factory...

Edit: Firmware Version: 1.1.1 Build 20190827

Hello I am hoping anyone can help me? I recently update my archer c4000 v2 firmware update and now I no longer see 5ghz-1. All the lights are on, and the 2.4ghz and 5ghz-2 wifi shows up, but for some...