OnePlus 9 WiFi connection

To change Wi-Fi frequency band setting on your OnePlus 5, follow the steps:

Meanwhile, the OnePlus 9R supports 5G in India through 5G band N78 .19 May 2021

any tall oneplus 7 pro support 5 Ghz router ? It supports 5GHz . Check if the 5GHz bandwidth is enabled in the router.