Скачать или смотреть How to fully Activate Volte on Custom rom for OnePlus 7 pro (root needed)

I use Custom rom CrDroid and OnePlus 7 pro and activate Volte after some additional steps.
For this procedure You need to follow bellow steps:

1. Root your phone with Magisk or use KernelSu, if your custom rom support it. CrDroid rom support KernelSu so just install apk from this site
https://github.com/tiann/KernelSU/rel...

2. Download qpst-tool-v2-7-496 with driver (included in zip)
https://qpsttool.com/qpst-tool-v2-7-496

3.Install Minimal Adb fastboot tools
https://www.androidfilehost.com/?fid=...

4. Enable USB debugging on phone

5. In KernelSu give superuser permison for apk com.android.shell

6.Run Command prompt with follow commands
adb shell
su (grant su access)
setprop sys.usb.config diag,serial_cdev,rmnet,adb

7. Run PDC tool and select your carrier (or if you can not find your carrie on list choose some others near your Country and give a try).

8. Reboot phone

9.Done