Hi, Do you mean the power led does not come on? Ensure that you use the original power adapter; meanwhile, you can change another one with same spec. Besides, try to hard reset it by holding the...

There are multiple smart switches, they can switch on/off lights locally/remotely via kasa app, and they can work with alexa and google home. What I think is the TP-link switch is a good choice if...

You can contact the retailer or local stores/online stores to buy it.

Yes, the hardware version can affect the features supported by the router. Thanks for share these info, and I think you may have your final decision now, lol.

per I read, C9 does not support TP-Link DDNS; https://www.tp-link.com/en/home-networking/wifi-router/archer-c9/#specifications While cause they both have their pros, you may buy one of them based on...

have you ever checked the firmware of the extender? If it is not the latest one, update it first. Then you can reset it and reconfigure to give it a go.