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Samsung Galaxy J5 randomly restarts after a firmware update [Troubleshooting Guide]

Firmware updates are supposed to fix problems with your phone but sometimes they cause more issues. In fact, some of our readers who own the Samsung Galaxy J5 have contacted us regarding a problem that reportedly started after a firmware update–random reboots.

When it comes to problems powering on, we can attribute them to hardware issues but when it comes to booting up, it might be a firmware problem. The same is true when the phone randomly reboots but the thing is we’ve seen similar issues with other phones before that were caused by a failing battery.

We need to troubleshoot your phone so that we can determine the cause why it randomly reboots on its own. While it may seem clear that the problem started after an update, we really can’t be sure without doing some troubleshooting procedures. If you’re one of the owners of this phone and are currently experiencing similar problem, continue reading the article as you may find it helpful.

If you have other problems however, visit our Galaxy J5 troubleshooting page as we’ve already addressed some of the most common issues with this device. Browse through the page to find issues that are similar with yours and feel free to use the solutions we suggested. If you still need our help, fill up our questionnaire and hit submit to contact us.

Troubleshooting Galaxy J5 that randomly restarts after an update

In this troubleshooting guide, we will try to consider every possibility and rule each of them out until we can pinpoint the cause or the problem itself. But I assume that this problem occurred only after a firmware update and that there was no attempt to modify the firmware in any way because if that’s the case, the only solution is to flash the stock firmware back. If you didn’t try to modify the firmware, then continue reading for I will tell you what to do about this problem…

Charge your phone

It might still has plenty of battery but I still want you to plug the charger to a working wall outlet and connect your phone to it using the original cable. The purpose of this procedure is not to replenish the battery but to know if the phone still restarts even if it has a stable power source–the charger.

It’s possible that the battery is already damaged and may fail from time to time which will of course, result a restart. If this is the case, your phone will not randomly reboot when it’s plugged in. However, if it still does restart on its own even when connected to its charger, then try the next method.

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Run your phone in Safe mode and observe

By running your phone in safe mode, you’re temporarily disabling all third-party apps. It’s important that you try this procedure because it’s possible that the random reboots are due to an app that crashes. There are applications that can cause serious performance-related issues and it’s imperative you rule this one out before moving on to the next procedure. This is how you start your J5 in safe mode…

  1. Turn the device off.
  2. Press and hold the Power key past the screen with the device name.
  3. When ‘SAMSUNG’ appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see ‘Safe Mode’.

While in this environment, continue using your phone and wait for it to restart. If the problem doesn’t occur, then it’s clear that there’s an app that’s causing the problem. You have to find that app and uninstall it, you won’t need an application that causes some serious issues on your device.

  1. From any Home screen, tap the Apps icon.
  2. Tap Settings.
  3. Tap Apps.
  4. Tap the desired application
  5. Tap Uninstall.
  6. Tap Uninstall again to confirm.

Wipe cache partition

Corrupt system caches will also cause performance issues like this especially if they’re often used by the system. It’s important that you delete those files so that they will be replaced with new ones. You only have to do this procedure if the phone still reboots on its own even if it’s in safe mode or if it still continues after you’ve uninstalled some apps.

You just have to start your phone up in recovery mode and wipe cache partition so that all system caches will be deleted and replaced. Don’t worry, none of your files and data will be deleted if you follow this procedure:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  3. When the device logo screen displays, release only the Power key
  4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times key to highlight ‘wipe cache partition.’
  6. Press the Power key to select.
  7. Press the Volume down key to highlight ‘yes’ an press the Power key to select.
  8. When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
  9. Press the Power key to restart the device.

Reset All Settings

If wiping the cache partition hasn’t fixed the problem, then you should try bringing the phone back to its original settings or configuration as the problem might have been caused by some incorrect or messed up settings in your phone. All the settings will be brought back to factory defaults but in using this procedure, none of your personal files and data will be deleted. It’s safe for your data and it’s effective in dealing with problems like this so it’s worth a shot.

  1. From a Home screen, swipe up or down from the center of the display to access the apps screen.
  2. Navigate: Settings Settings icon > Backup and reset.
  3. From the Reset section, tap Reset settings.
  4. Review the info then tap RESET SETTINGS.
  5. If presented, enter the current PIN, password, or pattern.
  6. To confirm, review the info then tap RESET SETTINGS.

If this doesn’t fix the problem, then you have no other choice but to reset your phone.

Backup your files and reset your phone

As long as the problem started without apparent reason after an update, a reset will be able to fix it. However, you will have to make a backup of your important files and data as all of them will be deleted during the process. So, take time backing up those you don’t want to lose. After the backup, make sure to remove your Google ID from your phone so that you won’t be locked out of your device after the reset. Once everything is set and ready, follow these steps to reset your phone:

  1. Back up data on the internal memory. If you have signed into a Google account on the device, you have activated Anti-theft and will need your Google credentials to finish the Master reset.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  4. When the device logo screen displays, release only the Power key
  5. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  6. Press the Volume down key several times key to highlight ‘wipe data / factory reset.’
  7. Press Power button to select.
  8. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  9. Press Power button to select and start the master reset.
  10. When the master reset is complete, ‘Reboot system now’ is highlighted.
  11. Press the Power key to restart the device.

If the reset fails, then it’s time to bring the phone to the shop and let the tech handle the problem for you as it might be an issue with the hardware.

I hope this troubleshooting guide can help you. If you still need our help, contact us anytime.

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