If you want to get the whole thing back to how your Samsung Galaxy J7 was before, the simplest solution is Reinstalling stock Rom on Samsung Galaxy J7.
You can install the firmware manually on your Galaxy J7 Device via Odin, when in need. Check below guide to Install Android Marshmallow Stock Rom on Samsung Galaxy J7.
Before you start,
Follow the steps correctly otherwise you may brick your device. We are not responsible for any damage to your phone.
The following process is not tested by me but reported by many users that it works well
It will erase all your phone data, so we advise you first to take a complete backup of your phone and then proceed.
Ensure that your phone has at least 50-60% charged to prevent the unexpected shutdown in-between the process.
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Disclaimer: Follow the instruction at your own risk. We will not be liable if any damage occurs to your device and/or its components. It is recommended for technically talented users only.
Download Samsung Galaxy J7 Marshmallow Firmware
Odin Tool – here
Download Galaxy J7 2016 Stock Marshmallow Firmware – Download (Search your country and download 6.0.1 firmware)
How to Install Android Marshmallow Stock Rom on Samsung Galaxy J7 Manually
Download Galaxy J7 Marshmallow firmware from above link.
Unzip Odin tool on your computer and Run Odin.exe file.
Enable “USB Debugging” and “OEM Unlock” on your phone.
Now, boot your phone into ‘Download Mode’ (Press and hold Home + Power + Volume Down buttons together).
Now, connect your phone to your PC. You will get a blue sign in Odin. If not, install proper driver on your PC and start.
In Odin, make sure Re-partition is NOT ticked (tick only the Auto Reboot and F. Reset Time check boxes, see below screenshot for example).
Select AP in Odin and choose the firmware file (with .tar extension) you have unzipped.
If everything OK, click the Start button. Once the ‘Pass’ message is appeared in Odin, reboot your phone.
After the installation finishes, your phone will reboot automatically and present you the latest Android 7 Marshmallow Firmware on your Galaxy J7. Any question? Leave it in the comment section below.