Edited by Sesia01 at 2019-04-29 03:24
I'm glad to help you to solve that issue.
After rooting, install Root Essential app from Google Store.
Go to storage => app manager => tap on printer plugin (HP print service plugin) => tools => tap move to / system => Move => it will reboot the phone.
After that, the service will be activated automatically...
You can check the service installing another app for example NokoPrint, tap on notification NokoPrint service installed => will be opened the settings page with service disabled. Tap "< settings", you could see the others service activated in on. After check you could delete NokoPrint app.
You can use this mode with other plugin, I've tested HP, Epson and Google Cloud Print with successfull on Meizu M1 Note Flyme 18.104.22.168G let me know if works with other devices.
Have a nice day with lots prints.