Symptoms
No keyboard is presented when you try to enter text. Instead, you are prompted to speak into the microphone to type.
Cause
Teracube phones ship with a Gboard as the default keyboard app. Gboard is responsible for providing the system-wide keyboard for text input. If Gboard is disabled or uninstalled, the keyboard will no longer appear.
Solution
To re-enable Gboard, go to Settings > Apps & notifications > Tap “See all apps” > Then choose Gboard from the list of apps. Tap “Enable” to re-enable Gboard. The keyboard should work the next time you need to enter text.
If Gboard is missing from the list of apps, it may have been uninstalled. Open the Play Store, search for Gboard, then install it. Make sure the listed provider is “Google LLC”.
If the above does not work, then a slightly more nuclear option is to do Settings > System > Reset options > Reset app preferences