When I set the wireless settings to b/g/n/ax and check the “Luci” wireless settings, they appear to be the same as my previous configuration. The picture attached in my first post shows the similarities between the current settings and the previous ones.

However, I still have a few Sonoff devices that are not able to connect. The problem persists. If the “Allow legacy 802.11b rates” option is enabled, I am able to pair or operate the Sonoff DW2 WiFi, but all the other devices lose connection, especially the T1 UK2C (FW: PSF-B04-GL) and T1 UK3C (FW: PSF-B04-GL). Conversely, if I disable the option, I am unable to operate them.