Use APKPure App
Get Boot WiFi old version APK for Android
Enable or disable WiFi at startup
This app allows you to enable or disable the WiFi at startup (when you turn on or restart your smartphone).
WARNING
This service may not work in airplane mode
NOTE
The wifi will not be enabled / disabled immediately but when the system is ready
Features and Benefits
• Auto WiFi on off
• No root
• Easy to use
TROUBLESHOOTING
https://julietapp.blogspot.com/p/troubleshooting-general.html