Preferred network mode is not working in Redmi Note 4G

[AC Question]

Hi all,

I am using Xiomi Redmi Note 4G (android-kitkat) for the last 2 years. 5 months before preferred network type is working fine. After that, I bought a JIO sim then, I changed my preferred network as 4G. Now, I want to use vodafone sim on this mobile. I could not able to change preferred network type 4G to 3G or 2G. Could anyone please help me to resolve this issue.