Important: Also, boot your Moto G4 into TWRP recovery and take a backup of your EFS (TWRP > Backup > Select EFS > Swipe to Backup).In order to use method 2, you must have an unlocked bootloader and TWRP (You can download it here) installed on your phone.For method 1, your phone must be on Nougat firmware with build number NPJS25.93-14-18 ( Download here).Charge your Moto G4/G4 Plus to a sufficient battery level to avoid any sudden shutdown during the update process.
We also covered a detailed tutorial on how to backup Android devices completely.
Irrespective of the method you choose (Method 2 will completely wipe your phone including the internal storage), I strongly suggest you take a complete backup of all your data on the phone. Using it will not update your Moto G4’s bootloader and thus allow you to downgrade easily, should you ever want to do it. For the same reason, it is best to use the Android 8.1 Oreo TWRP Flashabe zip to upgrade. Since the OTA updates your phone’s bootloader and modem to the newer Oreo version, you will NOT BE ABLE TO DOWNGRADE back to Nougat if you choose to sideload the OTA and will be forced to wait for the stable Oreo update. So users who have an unlocked bootloader with TWRP can easily install Android 8.1 Oreo on Moto G4/G4 Plus. Another forum member Jleeblanch made TWRP flashable zips of the stock firmware. The new software comes with OPJ28.111-22-1 build number and December 2018 security patches. XDA Senior Member rajatgupta1998 was able to capture the Android 8.1 Oreo OTA package for the Moto G4/G4 Plus. Method 1: Sideload OTA using Stock Recovery. How to Install Android 8.1 Oreo on Moto G4/G4 Plus. 
Download Moto G4/G4 Plus Android 8.1 Oreo Firmware.Moto G4/G4 Plus Android 8.1 Oreo Update.The new firmware comes with the OPJ28.111-22-1 build number and brings December 2018 security patches. Update (9 September 2019): OTA package and TWRP Flashable zip of stable Android 8.1 Oreo for Moto G4/G4 Plus are now available.
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