GL-MT3000 connect to iPhone

Router can connect to home Wi-Fi but not iPhone hotspot. I read that it may help to change to wpa2 but i can’t find this option.
Can someone help me?

GL GUI → Wireless → Wireless → 5GHz WiFi → Wi-Fi Security

Sorry; you’re asking about Repeater mode, yes? See the section Join Other Network:

Can your other devices connect to the iPhone hotspot?

Do you want to change the iPhone hotspot or MT3000 to WPA2? Repeater will connect as per the hotspot encryption of the parent Wi-Fi, no need to set it manually.