Wi-Fi 6
How can I check my iPhone 12 Pro Max is on Wi-Fi 6? In the setting it’s not written and my router does support 802.11ax protocol, the router is Xiaomi Redmi Router AX6.
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To answer your original question, there is no way from the iPhone end to see what Wi-Fi protocol is being used. The only way to do that is to set up your router with different SSIDs for each protocol, then connect to that specific SSID. For all practical purposes, unless you have a gigabit connection from your router to the Internet there is no inherent difference between AC and AX in terms of performance. AC will support up to 480mbps, so unless your connection is faster than that it is moot.
However, you have a bigger problem than AC vs AX: Your security is not set correctly in the router. That has nothing to do with the connection protocol. A "Weak Security" notification means that your Wi-Fi router is not configured correctly. There is a new feature in iOS 14 and later and Mac OS Big Sur (11) and later that checks and displays a message if your router is not using the most up-to-date security settings. Note that your router has always had weak security, you just didn’t know about it until now.
See this Apple support article for how to configure it correctly—>Recommended settings for Wi-Fi routers and access points - Apple Support, specifically the section headed Security. And don't forget to configure your range extenders (if any) also!
After you change the router settings you should Forget the network in your phone settings and reconnect.
Note also that weak security does not interfere with using Wi-Fi, it is just a warning. Your Wi-Fi should still work normally, and, if it doesn’t, it is not because of the weak security message.
