Change default region and customizing payload data

[nurhazbiy]

Hello everyone, i'm currently doing a project that require me to customize the payload format, but as far as i know i need to change the default region to asian region, how can i set the default region in the source code? and does changing the AppData variable will automatically converted to the desired payload format in HEX format? or do i need to convert it myself? i'm quite new to this, thanks