How to enable Vol LTE on xperia XZ2 compact

[hoa101296]

My celluar support VOL LTE, I'm using on Samsung devices
But I can't enable Vol LTE on XZ2c
Could you tell me how to fix it, My device is H8324, rom Customized MY (Malaysia), Android 10

 

[MartinX3]

My celluar support VOL LTE, I'm using on Samsung devices

But I can't enable Vol LTE on XZ2c

Could you tell me how to fix it, My device is H8324, rom Customized MY (Malaysia), Android 10

Using a 10.0 custom ROM

Flashing the firmware of your region

Modifying the volte configs in your firmware