Why I can't change my preferred network on HTC one m8?

Apr 12, 2018
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When I enter this number*#*#4636#*#* it takes me to the phone information where I found the drop down list of preferred network types. My phone is showing no service and it was on wcdma/GSM/LTE (auto) . I was clicking on wcdma preferred but nothing happens. Can anyone help?
 

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