Hope the following way will be worked for all Android Devices.The following successfully done in Galaxy S5, Lollipop. Initial installation of Zawgyi font not supported anymore after upgraded to Lollipop. Zawgyi font for Lollipop
Step 1 – Install iFont
Step 2 – Install Zawgyi font from iFont Myanmar tab. You can go by tapping on MY circle icon.
Step 4 – Change Zawgyi One font in phone setting. Settings -> Display -> Font -> Font Style. The following choose the Zawgyi One font. Zawgyi One TTF is the one that previously installed in that phone and it is not supported anymore after upgrade to Lollipop.
Hope it is working for you too. Good Luck.