1. Unpair Existing Paired devices from Bluetooth Settings :
3. Uninstall Maestro / Evolute Impress / AEM App from APPS(Last Page of Novopay App)
4. change printer type to Maestro / Evolute Impress / AEM
5. Add Printer 
6. config printer Name->select printer name
7. change Fingerprint Scanner type to Maestro / Evolute Impress / AEM
8. Add Fingerprint Scanner 
9. config Fingerprint Scanner Name->select Fingerprint Scanner name
10. install Maestro / Evolute Impress / AEM App from playstore