Below you will find instructions how to root this device.
The following procedure has been tested up to firmware J120AUCU2APJ2
KNOX should remain 0x0
However you undertake this at your own risk.
Issues:
Wifi passwords not remembered (fix below)
Stock Flashlight app not working.
Model number may be missing from build.prop (fix below)
Instructions
1. Flash the eng boot image.
This is a special boot image normally used by engineers, it allows selinux to be booted in permissive mode with relaxed root restrictions.
Do not replace this image with the stock image after rooting your device or you will possibly soft brick your device.
(See below for how to recover)
ENG_BOOT_J120A_PG1
Download Odin v3.11.1
Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until you get a blue sign in Odin
Download the ENG_BOOT_J120A_PG1.tar to your PC and add it to AP / PDA in ODIN.
Make sure re-partition is NOT ticked
Click the start button, sit back and wait few minutes
2. Install and run Kingroot:
http://www.apkmirror.com/apk/kingro...-release/kingroot-5-0-5-android-apk-download/
You may need to run Kingroot several times to gain successful root.
3. Install and run SuperSU me to remove Kingroot and convert to SuperSU (not required) :
https://play.google.com/store/apps/...ore&pcampaignid=APPU_1_uzPDVbGyFcGNyATHrqmoCA
Alternative (free) method to replace Kingroot:
Follow Steps 3 to 12.
https://forum.xda-developers.com/ga...ide-how-to-root-tripping-knox-kitkat-t3129484
Don't flash the boot partition with Flashfire, uncheck.
You will also need to flash the system version of SuperSU not EverRoot.
When you get to step 12, don't flash the firmware. Disable EverRoot and just flash this:
https://forum.xda-developers.com/apps/supersu/v2-64-2-66-supersu-mode-t3286120
4. Wifi fix:
modify the line below in /system/build.prop:
ro.securestorage.support=true to false
5. To fix “Unauthorized actions have been detected”
disable 'security log agent'
6. Model number missing fix:
http://www.techgainer.com/change-fake-android-device-model-number-and-brand-name/
Enjoy your rooted device
To recover from a soft brick flash the firmware below.
https://firmwarefile.com/samsung-sm-j120a
FEEDBACK IS APPRECIATED PLEASE.
THANKS.
DONATE ME HERE IF YOU WANT TO BUY ME A BEER OR HIT THE THANKS BUTTON IF I HELPED YOU

The following procedure has been tested up to firmware J120AUCU2APJ2
KNOX should remain 0x0
However you undertake this at your own risk.
Issues:
Wifi passwords not remembered (fix below)
Stock Flashlight app not working.
Model number may be missing from build.prop (fix below)
Instructions
1. Flash the eng boot image.
This is a special boot image normally used by engineers, it allows selinux to be booted in permissive mode with relaxed root restrictions.
Do not replace this image with the stock image after rooting your device or you will possibly soft brick your device.
(See below for how to recover)
ENG_BOOT_J120A_PG1
Download Odin v3.11.1
Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until you get a blue sign in Odin
Download the ENG_BOOT_J120A_PG1.tar to your PC and add it to AP / PDA in ODIN.
Make sure re-partition is NOT ticked
Click the start button, sit back and wait few minutes
2. Install and run Kingroot:
http://www.apkmirror.com/apk/kingro...-release/kingroot-5-0-5-android-apk-download/
You may need to run Kingroot several times to gain successful root.
3. Install and run SuperSU me to remove Kingroot and convert to SuperSU (not required) :
https://play.google.com/store/apps/...ore&pcampaignid=APPU_1_uzPDVbGyFcGNyATHrqmoCA
Alternative (free) method to replace Kingroot:
Follow Steps 3 to 12.
https://forum.xda-developers.com/ga...ide-how-to-root-tripping-knox-kitkat-t3129484
Don't flash the boot partition with Flashfire, uncheck.
You will also need to flash the system version of SuperSU not EverRoot.
When you get to step 12, don't flash the firmware. Disable EverRoot and just flash this:
https://forum.xda-developers.com/apps/supersu/v2-64-2-66-supersu-mode-t3286120
4. Wifi fix:
modify the line below in /system/build.prop:
ro.securestorage.support=true to false
5. To fix “Unauthorized actions have been detected”
disable 'security log agent'
6. Model number missing fix:
http://www.techgainer.com/change-fake-android-device-model-number-and-brand-name/
Enjoy your rooted device
To recover from a soft brick flash the firmware below.
https://firmwarefile.com/samsung-sm-j120a
FEEDBACK IS APPRECIATED PLEASE.
THANKS.
DONATE ME HERE IF YOU WANT TO BUY ME A BEER OR HIT THE THANKS BUTTON IF I HELPED YOU

Last edited: