How to fix your Samsung Galaxy S9 Plus that became so sluggish after a firmware update (easy steps)

Performance issues are often a sign of a firmware problem. It’s because the firmware is the one responsible in making your phone run the way you want it to be. During firmware updates, some files may become corrupt or obsolete and this may lead to a problem. Such could be the case with some of our readers that own the Samsung Galaxy S9 Plus who’ve been complaining about the sluggishness of their devices that reportedly started after a firmware update. We need to look into this problem for the benefit of our readers who contacted us regarding the problem.

So, in this post, I will walk you through in troubleshooting your Galaxy S9 Plus that became so slow and sluggish after a firmware update. We will try to look into each possibility and rule them out one by one until we can determine what the problem is so that we can try to formulate a solution that may bring your phone back to its normal buttery smooth operation. If you’re one of the owners of this device or any Android phone for that matter, continue reading as this post may be able to help you one way or another.

Before going further, if you found this post because you were trying to find a solution to your problem, then try to visit our troubleshooting page as we’ve already addressed most of the commonly reported issues with the phone. We’ve already provided solutions to some of the problems reported by our readers so try to find issues that are similar with yours and use the solutions we suggested. If they don’t work for you and if you need further assistance, fill up our Android issues questionnaire and hit submit.

How to troubleshoot Galaxy S9 Plus that became so sluggish after an update


If the only problem with your phone is that it’s slow and sluggish, then it’s a very minor problem and you can fix it on your own without having to bring the phone to the technician. All you gotta do is do some basic troubleshooting procedures and you can make your phone run normally in no time. With all that being said, here’s what you’re supposed to do…

First solution: Perform the Forced Reboot

After the update and you haven’t tried doing the Forced Reboot to refresh your phone’s memory and reload all applications and services, then it’s the perfect time to do it. It’s possible that this problem is basically just a result of a minor glitch in the firmware. Glitches can be addressed by rebooting the phone and this procedure is far more effective than the normal reboot.

To do this, press both the volume down and power keys at the same time and hold them down together for 10 seconds or more. Your phone will restart it the normal reboot. After this, observe your phone closely to know if it’s still slow and sluggish because if so, then move on to the next procedure.

Second solution: Run your phone in Safe Mode

By doing this, you’re temporarily disabling all third-party applications in your device and it’s important to do this so that you would know if the problem is caused by third parties or not. If your phone runs smoothly while in safe mode, then we can say that the reason why it’s slow or sluggish is because of some of your applications. But don’t do anything yet, instead reboot your phone back to normal mode and close apps running in the background. Close observation is needed to know which app makes your phone slow.

Here’s how to run your phone in safe mode:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen appearing on the screen.
  3. When SAMSUNG appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume downkey.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. When Safe mode appears in the bottom left corner of the screen, release the Volume down key.

If the problem continues to bug you, then try uninstalling the app that, you suspect, is causing the problem. Finding out which one is the culprit is much of a challenge but try uninstalling apps you installed about the same time the problem started.

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Apps.
  3. Tap the desired application in the default list.
  4. To display preinstalled apps, tap Menu > Show system apps.
  5. Tap UNINSTALL > OK.

However, if the problem is still  happening even if your phone is in safe mode, then we might be facing a possible firmware issue. You have to troubleshoot the firmware in the following procedures.

Third solution: Delete system cache

I’ve encountered so many similar cases in the past wherein a problem like this was caused by some corrupt or obsolete system cache. In your case, you need to rule this possibility out by deleting all system caches so that they will be replaced with new ones. To do this, you have to run your phone in recovery mode and wipe the cache partition from there…

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Android logo displays, release all three keys.
  4. An ‘Installing system update’ message will show for 30 – 60 seconds before the Android system recovery menu options appear.
  5. Press the Volume down key several times to highlight wipe cache partition.
  6. Press Power key to select.
  7. Press the Volume down key to highlight yes, them and 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.

After doing this, take time observing your phone closely to know if the problem continues and if it still does, then you have no other choice but to do the next procedure.

Fourth solution: Backup your important files and reset your phone

After the first three solutions and your phone is still slow and sluggish, then you have no other choice but to reset your device so that it will be brought to its default settings and configuration. You may lose some of your files and data by doing this that’s why we’re always hesitant to suggest it. But in this case, you really have no other choice. A reset is very effective especially when it comes to firmware issues. Just make sure to make a backup of your important files and data.

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  5. Press Power button to select.
  6. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  7. Press Power button to select and start the master reset.
  8. When the master reset is complete, ‘Reboot system now’ is highlighted.
  9. Press the Power key to restart the device.

I hope that this troubleshooting guide can help you fix your Galaxy S9 that keeps on rebooting by itself. If you have other concerns you want to share with us, feel free to contact us or leave a comment below.

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