If you have since updated your iPhone you may see the range extender’s Wi-Fi shown as having weak security. This is due to the range extender supporting the mixed WPA/WPA2 (AES/TKIP) by default for compatibility purposes. The iPhone now recognizes WPA as a weak security type. This may also be the same with other security suites with a similar notification.
Why range extender network is displayed as “Weak Security”?
A range extender is essentially a device that connects to an existing Wi-Fi hotspot and repeats the signal, so generally, it will generate the wireless security of the host Wi-Fi hotspot. While the default wireless security of the TP-Link range extender itself was auto, it supports WPA2+AES, as well as older WPA+TKIP for compatibility with older devices. Even though your iOS device recognizes the range extender network as weak security, it connects to the network with the stronger WPA2+AES by default, so there won’t be any security concerns upon to this point.
What to do?
Modify the wireless security on your host Wi-Fi to the stronger WPA2+AES encryption, then reboot it.
Restore the range extender to the factory default settings and re-associate the host Wi-Fi through the web page Quick Setup (Tether is not recommended). Guidance is as below:
If some of your devices cannot connect to the whole Wi-Fi network after these modifications, you may need to change the wireless security back.
Let the community know if you have any further inquiries, thanks a lot~