How to fix Galaxy M40 wifi not working | won’t connect to wifi

Fixing wifi connectivity troubles is not that hard. If your Galaxy M40 wifi is not working and you have no idea how to troubleshoot it, you’ve come to the right place. Learn how to fix your problem by doing our suggestions in this guide.

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How to fix Galaxy M40 wifi not working | won’t connect to wifi

Fixing wifi issues is often easy. If you’re wondering how to fix wifi not working issue on your Galaxy M40, follow our suggestions below.

Galaxy M40 wifi not working fix #1: Verify wifi is working

When dealing with any wifi trouble on your Galaxy M40, the first thing that you want to do is check whether or not the cause comes from the router-side. A good question to ask would be: are there other wireless devices having the same problem as you are? If there are other phones that shows the same exact issue like the one on your M40, then your troubleshooting should focus on fixing the wifi network issue. There may be a router bug behind the trouble or your internet connection from your Internet Service Provider (ISP) may be problematic. If you have access to the router, try to unplug it from the outlet for 10 seconds. Once it has restarted, check for the problem on your phone. If you have no direct access to the router, let the wifi administrator know of the issue.

Galaxy M40 wifi not working fix #2: Check for errors

If there’s no router or ISP issue at all, your next move is to see if there’s any error that shows whenever you use wifi. Errors are there to help in identifying the reason for a problem. If your Galaxy M40 displays a particular error code or message, try to take note of it. Then, do a quick Google search about it. Make sure that you type in the exact error. If you’re lucky and the code is a known one, there may be a workaround that you can follow. If there’s none, or if there’s no error at all, continue with the rest of the troubleshooting steps below.

Galaxy M40 wifi not working fix #3: Perform soft reset

If you’ve already performed the first two steps above, then the next troubleshooting steps that you would like to do is force restart your Galaxy M40. This has been an effective way to fix wifi issues. Some network bugs develop when a system runs for a long time. Refreshing the system with a restart is often used as a quick workaround.

To force restart your device:

  1. Press and hold the Power + Volume Down buttons for approximately 12 seconds or until the device power cycles. Note: Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. Note: Utilize the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Allow up to 90 seconds for the reset to complete.

If Maintenance Boot Mode screen won’t show, then your device does not have it. Simply wait for the device to power down completely.

Galaxy M40 wifi not working fix #4: Reset network settings

Another important troubleshooting step that you want to do in this case is to reset all network settings. This troubleshooting step will clear all non-default network settings and hopefully clear potential bugs. If you haven’t tried this yet at this stage, here’s how:

  1. Open Settings app.
  2. Tap General management.
  3. Tap Reset.
  4. Tap Reset network settings.
  5. Tap Reset settings to confirm.

Galaxy M40 wifi not working fix #5: Wipe cache partition

If your Galaxy M40 wifi is still not working, continue with your troubleshooting by clearing the cache partition. This is a portion in your device’s internal storage that keeps the system cache.

Sometimes, updates or changes to the system may corrupt the system cache, which in turn, can lead to bugs. Android depends on a set of temporary files called system cache to load apps quickly. If this cache gets corrupted or outdated, a device may suddenly lag, freeze, or show signs of slow performance. At other times, uncommon glitches may occur as well as overall performance of the system may also be affected. To ensure that your M40 has good system cache, we suggest that you clear it once every few months. Here’s how to do it:

  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 cache partition’.
  5. Press Power button to select.
  6. Press the Volume down key until ‘yes’ is highlighted and press the Power button.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

Galaxy M40 wifi not working fix #6: Reconnect wifi

Another basic troubleshooting step that you can do in this case is to forget your wifi. This has proven effective in fixing troubles with wifi. What it does is refresh the wifi credentials saved on your phone. By disconnecting your wifi, you are forcing the device to save updated wifi username, password, and configuration.

In order to forget your wifi network:

  1. Pull down the notification bar from the top of the screen.
  2. Tap and hold the wifi icon.
  3. Tap the name of your wifi network (the one you’re having a problem with).
  4. Tap FORGET button.
  5. Restart your phone.
  6. Reconnect to your wifi and see it it’s working now.

Galaxy M40 wifi not working fix #7: Check wifi connection on Safe Mode

Sometimes, a bad third party app may cause problems with other apps or with Android. If Galaxy M40 wifi not working issue started after you installed a new app, that can be the reason of the problem. Delete it and see if it will fix the problem.

If you can’t remember which app was installed, you can simply restart the phone to safe mode. In this mode, no third party apps can run. If wifi works normally, that means that you have an app problem.

Here are the steps to restart to 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’.

If your Galaxy M40 wifi works normally on safe mode and you think that you have an app problem, you should investigate further. To identify the culprit, you can use the method of elimination. Here’s how:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your M40 is still problematic, repeat steps 1-4.

Galaxy M40 wifi not working fix #8: Factory reset

The final troubleshooting step that you can perform on your device is factory reset. If the cause of the problem is an unknown software bug, this might help. Make sure to create a backup of your personal data before doing this reset.

Below are the two methods to do a factory reset on your M40:

Method 1: How to hard reset on Samsung Galaxy S10 via Settings Menu

This is the easiest way to wipe your Galaxy S10. all you have to do is to go under Settings menu and follow the steps below. We recommend this method if you have no trouble going under Settings.

  1. Create a backup of your personal data and remove your Google account.
  2. Open Settings app.
  3. Scroll to and tap General management.
  4. Tap Reset.
  5. Select Factory data reset from the given options.
  6. Read the information then tap Reset to continue.
  7. Tap Delete All to confirm action.

Method 2: How to hard reset on Samsung Galaxy S10 using hardware buttons

If your case is that the phone is not booting up, or it boots but Settings menu is inaccessible, this method can be helpful. First, you need to boot the device to Recovery Mode. Once you successfully access Recovery, that’s the time that you begin proper master reset procedure. It may take some tries for you before you can access Recovery so be patient and simply try again.

  1. If possible, create a backup of your personal data ahead of time. If your problem prevents you from doing that, then simply skip this step.
  2. Also, you want to make sure that you remove your Google account. If your problem prevents you from doing that, then simply skip this step.
  3. Turn off the device. This is important. If you can’t turn it off, you’ll never be able to boot to Recovery Mode. If you are not able to shut the device off regularly via the Power button, wait until the phone’s battery is drained. Then, charge the phone for 30 minutes before booting to Recovery Mode.
  4. Press and hold the Volume Up button and the Bixby button at the same time.
  5. While still holding the Volume Up and Bixby keys, press and hold the Power button.
  6. The Recovery screen menu will now appear. When you see this, release the buttons.
  7. Use the Volume Down button until you are highlighting ‘Wipe data/factory reset.’
  8. Press the Power button to select ‘Wipe data/factory reset.’
  9. Use Volume Down to highlight Yes.
  10. Press the Power button to confirm factory reset.

IMPORTANT: After resetting the phone, set it up again and make sure to install any available Android and app updates.

Galaxy M40 wifi not working fix #9: Get help from Samsung

If your Galaxy M40 wifi is still not working even after a factory reset, there must be a problem with the hardware. Visit your local Samsung store or Service Center so you can set up an appointment for repair.


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Harvey Hisona

Harvey is keen with mobile technology and loves writing about all things mobile. He is passionate in helping technology-challenged people by finding resolution to their issues. Contact me at Email

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