How to fix Galaxy S9 Plus Problems after Android Pie Update


A couple of days back, Samsung started the official rollout of the Android Pie update for the Galaxy S9 Plus. The update first made it to Germany and then slowly made it to 3-4 other countries. Galaxy S9 Plus was running on the Android Pie beta for the past couple of months. Everyone was waiting for the stable Android Pie update since the Beta firmware had quite many bugs. When the official update started rolling out, the Galaxy S9 Plus owners were quite happy at first. The only reason was that this update was supposed to be bug-free. Unfortunately, the opposite happened. The stable Android Pie for Galaxy S9 Plus does not seem to be very stable.

fix Galaxy S9 Plus Problems after Android Pie Update
Fix Galaxy S9 Plus Problems after Android Pie Update

The update, in fact, has forced a handful of Galaxy S9 Plus owners to move back to Android Oreo. If you have updated your Galaxy S9 Plus to Android Pie and you are now facing issues, it is better to try resolving the issues rather then moving back. So here is the guide you need to fix Galaxy S9 Plus problems after Android Pie update. Before going through the Android Pie Problems after Pie Update, let us take a look at the new features.


Galaxy S9 Plus Android Pie Update – New Features

One UI

The Android Pie update is a major update. This is not just a software version upgrade, the update brings everything new. For example, the moment you turn on your phone on Android Pie, you will find a whole new UI. Samsung has revamped its Samsung Experience UI and it is now called One UI. The One UI is inspired by the looks of stock Android. Samsung has made everything rounded in this UI. There is the new recent applications menu. The icons, the elements, the UI of all stock applications is new. One UI also brings navigation gestures, which were missing so far on Samsung Galaxy handsets. This latest update adds a plethora of new features to the phones.

Android Pie - One UI
Android Pie – One UI

New Features

When it comes to the new features, you will find the Night Mode in the phones first of all. This Night Mode is something that the OnePlus and Huawei users have been enjoying for quite a while. The Night Mode basically turns the entire UI black. The purpose of this mode is to provide a better viewability in the night and also to save a little bit of battery. Samsung has also added the Adaptive Battery mode which learns about your usage and then optimizes the battery based on your use.

This update also adds the Dex support without the Dex station. Another new feature is the pop-up notifications. Any notification will pop-up, you will be able to respond to it and continue doing whatever you were doing previously. There is native private DNS support in this update. You can now track the battery percentage of your Bluetooth device. The update improves the overall performance of the phone. The bugs of Android Oreo have been fixed. This update moves the version number of Android to Android 9.0.

There are many other features that we can discuss, but it will take way too long to do that right now. I have highlighted the major changes above only. It is the time to take a look at the Galaxy S9 Plus Problems after Android Pie and fix them. Let us get back to the guide now.

Fix Galaxy S9 Plus Problems after Android Pie Update

This guide is divided into two parts. In one part, I am going to list all the Galaxy S9 Plus problems after Android Pie update and their solutions. In the second part, I am going to explain the methods to apply those solutions. The reason to explain the methods separately is that a single method fixes multiple problems. It is not a good idea to write it again and again and end up confusing the Galaxy S9 Plus owners. So, read this guide carefully to fix your Galaxy S9 Problems that is acting up after flashing Android Pie.

Galaxy S9 Plus Randomly Reboots after updating to Android Pie

Galaxy S9 Plus owners took it to Reddit to report the random reboot issue after the Android Pie. The phone starts rebooting on it again any time of the day. There are various methods to fix the random reboot issue that the S9 Plus owners have used to fix it. Here are all the possible solutions. Try these solutions one by one in numerical order to see which one works for you.

  1. First of all, clear the cache of your Galaxy S9 Plus. Clearing cache is like one medicine for 100 diseases. Check your phone after clearing the cache.
  2. If clearing cache does not work, boot your Galaxy S9 Plus in the Safe Mode and check if it works fine. If the phone is working fine in the Safe Mode, it would mean that an application was causing an issue. Go through all of your recent installations and delete the application that you think is causing trouble.
  3. Safe Mode did not work? Go ahead and perform a factory data reset on your phone. If the factory data reset doesn’t work either, your last option is to flash a new update. Make sure that you make a clean installation this time.

Lock screen notifications vanished after Android Pie – how to get them back

You will find that after updating to Android Pie, the notifications on the lock screen are not showing the details anymore. This is the default setting in the Android OS. You have to enable the full view for content in notifications under the lock screen settings. When you will open the settings to enable the detailed view, you will not find the content settings where they used to be. Here is how to get the detailed notifications back in Android Pie.

  1. Open Settings and go to Lock Screen.
  2. In Lock Screen settings, click on Notifications.
  3. Now click on View Style > Detailed.
  4. You will get the notifications with content now. That’s it.

Galaxy S9 Plus stuck in the boot loop right after installing Android Pie

You just flashed the Android Pie or updated via OTA, and the phone is now stuck in boot loop. What to do now? First of all, you do not need to panic. Here are your options to get out of this situation.

  1. The very first thing is to try clearing the cache. Clear the cache and reboot the phone. See if it works.
  2. If the cache thing doesn’t work, go ahead and perform a factory data reset.
  3. If the factory data reset doesn’t work either, go ahead and flash a new firmware. Perform a clean installation to get rid of the issues.

Night Mode on the Galaxy S9 Plus does not stay on all the time – It turns off automatically

When you turn on the Night Mode from the developer options, it goes off on its own. In order to keep the Night Mode on all the time, you must enable it from the Night Mode settings and not from the developer options. So, if the Night Mode on the Galaxy S9 Plus does not stay on all the time, here is what to do.

  • Open Developer Options > Night Mode > Switch it off.

Galaxy S9 Plus started lagging after updating

For some users, the Galaxy S9 Plus started lagging right after the new update. The lag happened mostly while switching between the applications through the recent applications panel. To fix this problem, here is what you can do.

Note: Try these solutions one by one.

  1. First of all, make sure that you have not changed any animation settings under developer options. If you have, then revert them back.
  2. Clear the Cache of your Galaxy S9 Plus and check the performance afterward.
  3. You can also try clearing the cache of the particular application that is having an issue.
  4. Boot your phone in the Safe Mode, check the performance of applications in Safe Mode. If they work fine, you must find the application that is slowing down all other applications.
  5. Perform a factory data reset if all the options given above do not work.
  6. Your last option is to wait for a new update. As soon as Samsung releases a more stable update, perform a clean installation of that.

How to disable Google Assistant on Android Pie-powered Galaxy S9 Plus

In the earlier version of Android, there was an option to hold the home button, open the Google Assistant and then disable it completely. The same is not possible on the Android Pie. Here is how you can disable the Google Assistant on the Android Pie.

  1. Go to Settings and open Apps.
  2. Click on the three-dotted (hamburger) icon on the top-right.
  3. Now tap Default Apps > Device Assistant > Choose None.
  4. This will completely disable the Google Assistant.

How to disable Bixby on Galaxy S9 Plus after updating to Android Pie

To disable Bixby on Galaxy S9 Plus powered by Android Pie, you have to install the BxActions application. Using BxActions, you can remap the Bixby Button tor completely disable it too. It is a nice application to get rid of the annoying Bixby.

Battery drains faster on S9 Plus after Android Pie

So the battery on your Galaxy S9 Plus is draining faster despite having the Adaptive Mode. Here is what you can do to fix the battery drain problem on the S9 Plus.

  1. First of all, turn on the Adaptive Mode. Let the Adaptive Mode run for a few days. Adaptive Mode an take a good 2-3 days to learn your usage.
  2. If this does not fix the problem, you can calibrate the battery manually. To do this, discharge your phone to 0% and let it go off. Once it goes off, charge it to 100% and disconnect the charger. Do not charge the phone in between. Let it drain to 0% again, charge it back to 100. Repeat this process thrice to calibrate the battery.
  3. Calibration did not work? Try wiping the cache of your phone.
  4. Open battery stats and check if a particular application is consuming more battery. Delete any such applications.
  5. You can also try booting your phone in Safe Mode to see how the battery performs without all the third-party applications.
  6. If the solutions given above fail to work, go ahead and perform a factory data reset.
  7. If you think that something is wrong with the firmware itself, wait it out. Let Samsung release a more stable update and perform a clean installation once an update is out.

Unable to turn off Battery Saver on S9 Plus

Some users were unable to turn off the Battery Saver on the latest firmware. To disable the battery saver, open Settings and enable the High-Performance mode. Now enable the Optimized Mode once again. This will disable the Battery Saver.

Galaxy S9 Plus charges slowly after Android Pie

If your phone has started charging slowly all of a sudden, these are your options.

  1. Use OEM data cable to connect your phone to the charger.
  2. Use original charging brick that came with your phone.
  3. Check your electric connection if it is giving proper output.
  4. Verifying everything listed above, clear the cache of your phone.

WiFi not working fine after the recent update

If the WiFi is not working, first of all, you need to diagnose the problem. Here are the possible fixes.

  1. Open Settings > Connections > WiFi > Choose your connection > Forget it.
  2. Connect to the network again and see if it works fine.
  3. If it still does not work fine, check your router on another device. If the other device is having the same issue, you need to fix the router. Try restart the router or completely resetting it.
  4. Make sure that your Mobile Data is disabled while you try to connect to WiFi.
  5. Enable Airplane Mode and disable it and then see the WiFi.

Galaxy S9 Plus showing not registered on network error

If you are getting the “Not registered on network error” after updating your S9 to Android Pie, you may check your network settings for this Here is what you can do.

  1. Open Settings > Connections > Mobile Networks > Network Mode > It should be set to “Auto Connect”.
    Galaxy S9 Plus Network Mode
    Galaxy S9 Plus Network Mode
  2. The second option is to choose your network. Open Settings > Connections > Mobile Networks > Network Operators > Search Network Operators > Choose your operator from the list.
    Galaxy S9 Plus Network Operators
    Galaxy S9 Plus Network Operators
  3. The last option to fix this problem is by resetting the network settings. To do this, go to Settings > About phone > Reset > Reset Network Settings > Reset Settings. Done.

How to apply the solutions

Clear Cache

How to clear cache on Galaxy S9

First of all, power down your Galaxy S9 Plus.

Press and hold Volume Up + Bixby + Power button to turn on the phone.

Keep the keys pressed until you see the screen.

Once you are in the recovery mode, press the volume down key to highlight “Wipe cache partition”.

Press the Power button to enter.

Now press the Volume Down button to highlight “Yes” and press Power button to wipe it.

Reboot the phone now.

The cache has been wiped.

Enter Safe Mode

How to enter Safe Mode on the Galaxy S9 Plus

First of all, turn off our Galaxy S9 Plus.

Now turn on the Galaxy S9 Plus while pressing and holding the Volume Down button.

As you see the home screen, let the Volume Down button go. You will see the Safe Mode watermark on the lower left corner of the screen.

Your phone is now in the Safe Mode.

All Apps have been disabled.

Clear App Cache

How to clear application cache on Galaxy S9 Plus

Open Settings on your phone and go to Apps or Application Manager.

Now select All Apps from the drop-down shown at the top.

This will show all the applications installed in your phone.

Now select the application who’s cache you want to clear.

Click on Storage > Clear Cache and Clear Data (If needed).

Factory Data Reset

How to perform factory data reset on Galaxy S9 Plus

Shut down your Galaxy S9 Plus completely.

Press and hold Volume Up + Bixby + Power button to get into the recovery mode.

Once you see the recovery, let the keys go.

Now in the recovery, use Volume Down key to highlight “wipe factory data reset”.

Press the power button to make a selection.

In the new screen, press Volume Down to highlight “Yes” and then again press the Power button to make a selection.

Your phone will perform a factory data reset, reboot it afterward. That’s all.

Clean Firmware Installation

How to perform clean software installation on S9 Plus

Open this guide to flash stock Android Pie on the Galaxy S9 Plus.

Now follow this guide to install the firmware from scratch.

While selecting the files, select the CSC file in the CSC tab. The CSC file will factory reset your phone.

Selecting the Home_CSC file does not wipe the phone, so to perform a clean installation, you have to select CSC file.

Flash the firmware now.

This installation will go clean. That’s all.


That is pretty much it with the Galaxy S9 Plus problems after Android Pie and their solutions. If you have anything to add to this guide, or if you are facing any problems that are not listed here, please feel free to reach out to us. We will make sure to get back as soon as we get your query. Stay connected.

Usama is a software engineer by profession and at he uses his expertise to solve everyday consumer tech problems with his main areas of interest being Android, iOS and Windows.

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