Weak Security option

talib297 Said:

"Weak Security option: how to remove weak security option if router's WPA3 is not available.... please tell me"

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Enable WPA3 Security.

Log in to your router using the Default Gateway, seeing if you can make the protocol for the network be WPA3. Look up the User Manual, if you are uncertain how to perform this.

About the Default Gateway:

Using a Web browser, ender either of these IP Addresses into the Address Bar, and then press return.

192.168.0.1
192.168.1.1

You will have to consider buying a new router that has WPA3 capability if you want the weak security message to go away.