Ensure that battery optimization is turned off for your custom font installer app. If the system puts the installer app to sleep, the injected font mapping may break. To help narrow down the best solution, let me know:
Avoid sites that force you to download an executable ( .exe ) or an unknown manager app just to get the font. choco cooky font apk for android 11
The app will ask you to install an official, signed font from your manufacturer's store (often the "SamsungSans" font). Ensure that battery optimization is turned off for