Clearing the Cache Partition:

NOTE: if your smartphone is not working properly and you're thinking about master resetting it, then you might want to try and clear the cache first. By doing so, you can avoid the deletion of personal data stored on your phone's internal memory. Unlike when you apply a master reset, clearing the cache will not result in personal data loss.

  1. Power off your smartphone
  2. Press and hold "Volume up", "Home" and "Power" at the same time
  3. After the phone vibrates, release the "Power" button but continue to hold "Volume Up" and "home"
  4. Once the "Android System Recovery" screen appears, release all the hardware buttons
  5. Using the "Volume Down" button, navigate to and highlight "wipe cache partition"
  6. Press "Power" to select the option
  7. Once the cache partition has been wiped, "Reboot System Now" should be highlighted
  8. Press the "Power" key to reboot your device

NOTE: if clearing the cache didn't help, then you might have to reset your device. To do so, please visit this link for a full guide on how to factory reset the SGS5 using the settings menu or hardware buttons.

Safe Mode

NOTE: If you've installed a malicious third party app that prevents you from uninstalling it, you can reboot your device in safe mode in order to fix this issue. In safe mode, all 3rd party apps are disabled and can be easily uninstalled.

Rebooting in Safe Mode:

  1. Power off the handset
  2. Press and hold the "Power" button
  3. Once the "Samsung Galaxy S5" splash screen pops-up, release the "Power" key and immediately press and hold "Volume down" instead
  4. Keep pressing the volume button until the device reboots completely
  5. If you've successfully rebooted in safe mode, you should see a "Safe mode" notice in the lower-left corner of the screen
  6. When in safe mode, release all the hardware buttons

Uninstalling Third Party Apps and Disabling Safe Mode:

  1. While viewing the home screen, tap the "Apps" icon
  2. Tap "Settings"
  3. Under "Applications", tap "Application manager"
  4. Swipe to the "Downloaded" screen
  5. Select the app that you wish to remove
  6. Tap "Uninstall" and confirm by pressing "OK"
  7. To exit safe mode, press and hold the "Power" button and tap "Restart" on the touchscreen

See More: Samsung Galaxy S5: Clearing the Cache Partition and Rebooting in Safe Mode