Wifi Coaxial Connector Aerial Flex Ribbon For Huawei P20 P30 P40 Pro P30 Lite P40 Lite P40 Pro+ Antenna Signal Flex Cable Parts - Mobile Phone Flex Cables - AliExpress
What is that little cable for? : r/mobilerepair
Connect to Wi-Fi - Huawei P30 Lite - Android 9.0 - Device Guides