1. Settings >> Language and region >> Region - Myanmar
2. Install one of the apk's
3. Settings >> Display and brightness >> Support dai characters (enable)
If you wanna switch to another font then,
1. Disable :: support dai characters
2. Install another apk
3. Enable :: support dai characters
Changing region to Myanmar will change the time. So switch to your country's time zone.
1. Settings >> Additional settings >> Date and time >> Disable :: automatically set time and date
2. Time zone : Choose your respective time zones.
Done and done.