Here is the list of Oppo Devices that Boomerang in child mode supports:
|OPPO Find X||CPH1875||OPM1.171019.026|
|OPPO R17 pro||CPH1877||OPM1.171019.026|
Other Oppo legacy devices will encounter an issue where the Accessibility Permission that Boomerang needs will not "stick" around. Oppo is aware of this and moving forward, Oppo automatically treats Boomerang as an exempted app so that the battery optimization does not remove Boomerang's permission.
If you have an Oppo or Vivo (device) and the permission is not "sticking" in place, check out:
Note: Boomerang's parent mode works on any Oppo device as parent mode does not require any Android permissions.