See here for introductory information about manufacturer specific issues...
We don't have much data on vivo devices so these instructions are not as developed. If you have a vivo device and are experiencing issues, try following these instructions.
If you find the instructions are unclear, incorrect, or you are still having problems, please email us at firstname.lastname@example.org and we will do our best to help.
- Whitelist the Simple In/Out app in the Background Startup Manager
- Whitelist the Simple In/Out app in the Phone Optimizations screen