Samsung Galaxy J hard reset
On dial screen enter this Samsung Galaxy J reset code: *2767*3855#
Use Samsung Galaxy J Backup and reset function
Go to Settings > Backup and reset > Factory data reset: Reset settings to the factory default values and delete all data.
Your device freezes or has fatal errors
If your device freezes or hangs, you may need to close applications or reinsert the battery and
turn on the device to regain functionality. If your device is frozen and unresponsive, press and
hold the Power button for more than 8-10 seconds to reboot.
If this does not solve the problem, perform a factory data reset. On the Applications
screen, tap Settings -> Backup and reset -> Factory data reset -> Reset device -> Erase everything. Before performing the factory data reset, remember to make back-up copies of all important data stored on the device.
Samsung Galaxy J soft reset / restart
Press and hold for 8-10 seconds to reset the device if it has fatal errors or hang-ups, or freezes. This will restart your Samsung Galaxy J Android phone.