If you unlocked your device, then you might be seeing an unlocked bootloader warning message every time you restart your device like the below image.If you want to remove it then, you can you do it very easily just follow below three steps, and the message will be replaced the with moto logo hence your problem will be solved.
Your device has been Unlocked and can’t be trusted
To learn more visit :Motorola website
You will get warning message something like that every time you reboot your device.Don’t worry its just a warning you can remove it by flashing the stock splash screen of Motorola and make it as it was earlier.
#How to Remove Unlocked Bootloader Warning Message in Moto G4 Plus
1.Download Moto G4 Plus Logo.zip
2.Download Motorola USB Drivers.
3.Download Mfastboot and extract it on the desktop.
4.Extract Moto-G4-plus-logo.zip in Mfastboot folder
5. Now turn OFF you Mobile.
6. Then Turn On it again By holding (Volume down button and power button) at the
same time for 6 sec and release it you will again see the bootloader.Now plug your device into your PC.
fastboot flash logo logo.bin