Check the OTA by going to Settings > Software update > Download and install. Galaxy J7 Duo (SM- J720F) One UI update (build J720FDDU4BSG7) OTA update is now live. July 2019 Android security patch (1 July 2019) is another important change of the update. It will bring new features and a completely new look and feel. The most important change in this update is One UI (version 1.1), Samsung latest Android skin based on the Android 9 Pie. Now, Galaxy J7 Duo starts getting the One UI update, which weighs around 1.2GB in size.
Install the latest TWRP recovery on Samsung Galaxy J7 2018.Samsung has already upgraded many of their non-flagship phones to Android-Pie based One UI, such as Galaxy On7, Galaxy J4, Galaxy J6, Galaxy J8, Galaxy A6, etc. You need to unlock the bootloader on Samsung Galaxy J7 2018. Download Samsung USB Drivers and Install on your PC. Do a full data wipe in the stock recovery (this is mandatory, the twrp wipe will not work). 
If you already have TWRP: then you can Create and Restore Nandroid Backup via TWRP. How to Backup Your Data on Android device. How to Backup Your Android Phone Directly to PC with TWRP!!. Backup Your Android Apps and Data with Titanium Backup. How to Backup Complete Stock or Custom ROM using TWRP recovery. How to Backup Your Android Phone Without ROOT. Take a complete backup of your phone data. Supported on Samsung Galaxy J7 2018 (SM-J737). So far this ROM worked smoothly on many devices. This ROM may or may not be completely stable and we don’t recommend you to try this ROM as a daily driver. GetDroidTips will not be responsible for any internal/external damages to the device that may happen while/after following this guide.
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