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How to fix Samsung Galaxy S6 Edge Plus that can’t boot up & keeps restarting after Marshmallow

Some of the owner of the #Samsung Galaxy S6 Edge Plus (#S6EdgePlus) are just getting the Marshmallow update and while many have been anticipating this new firmware because of its new features and improved performance, anticipation became frustration when problems occur shortly after the update. Some complained about their devices that won’t successfully boot up while others reported theirs started to reboot randomly without any apparent reason.

We will look into these issues and see if we can find a solution, or even a workaround, to help our readers. This post will guide you on how to troubleshoot your device and only owners with enough patience are advised to follow the procedures here. For those who don’t have much time or not comfortable tinkering their devices, I suggest you immediately go to a technician and have the device checked.

Before we jump into our troubleshooting, for our readers who have other concerns, kindly browse through our S6 Edge+ troubleshooting page as we have already provided solutions to hundreds of problems. Find issues that are similar or related to yours and use the existing solutions. If they don’t work or if you need further assistance, you can always reach out to us. Just fill up our Android issues questionnaire and hit submit. Don’t worry about anything as this is a free service but we ask you to provide us with sufficient information so we can provide reliable solutions.

Troubleshoot Galaxy S6 Edge Plus that won’t boot after Marshmallow update

Problem: Do you guys have any idea if the Marshmallow update for the Galaxy S6 Edge+ is bad or corrupt? My phone updated the other day and since then it won’t boot to the home screen. If I knew this would happen, I never would have updated my phone. Now, I can’t use it anymore because while booting up, it stays on the black screen after the logo. I already tried leaving it like that for hours but still there was no improvement. I am sure this problem started after the update so if you know how to fix this, please help me. — Jane

Troubleshooting: Hi Jane. Actually, you’re not the only one that has this problem but it doesn’t mean the firmware update that Samsung rolled out is bad. Sure there are problems that may occur but most of the time the issue is with the phone but we’d never know for sure if we don’t try to troubleshoot. For this problem, let’s try to find signs that would tell us whether the phone is still capable of booting up to safe mode and recovery mode.

Step 1: Boot in safe mode

While it’s safe to assume that the problem is with the firmware, there are times when apps do cause this kind of problem. Therefore, it’s wise to first boot the device in safe mode and move from there.

  1. Press and hold the Volume Down and Power keys for 20 to 30 seconds.
  2. Once you see the Samsung logo, release the Power key immediately but continue pressing the Volume Down key.
  3. Your phone should continue booting up and you will be prompted to unlock your phone as usual.
  4. You will know if the phone successfully booted in safe mode if the text “Safe mode” is displayed at the lower-left corner of the screen.

If the phone successfully booted up into safe mode, then there are third-party apps that may not be compatible with the new firmware and caused the device to fail while booting up. Launch the Play Store, go to My Apps and look for apps that need to be updated. When new firmware is rolled out, especially for major updates, app developers immediately roll out updates so their apps will be compatible with the new firmware and to minimize complaints from users. That’s the reason why you need to update your app.

Step 2: Boot in recovery mode and wipe cache partition

After you’ve updated all your apps, try to boot your phone normally and if it still fails, then it’s time to try and  boot it in recovery mode. The phone will try to load the bootloader without loading Android GUI. If successful, try to wipe the cache partition and see if the phone reboots successfully.

  1. Turn off the device.
  2. Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key.
  3. When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
  4. When the Android System Recovery screen appears, release the Volume Up and Home keys.
  5. Press the Volume Down key to highlight ‘wipe cache partition.’
  6. Press the Power key to select.
  7. When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
  8. Press the Power key to restart the device.

Step 3: Perform the master reset

I am confident wiping the cache partition will fix the problem but in case your Galaxy S6 Edge+ still won’t boot up, then you are left with no choice but to perform the master reset:

  1. Turn off your Samsung Galaxy S6 Edge.
  2. Press and hold the Volume Up, Home and Power keys together.
  3. When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
  4. Wait until the Android Recovery Screen appears after about 30 seconds.
  5. Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
  6. Press the Vol Down button again until the option ‘Yes — delete all user data’ is highlighted and then press the Power key to select it.
  7. After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.

Troubleshoot Galaxy S6 Edge+ that randomly reboots after Marshmallow

Problem: My new Galaxy S6 Edge+ is acting crazy after it updated its operating system a couple of days ago. It’s now randomly restarting and I don’t see any pattern actually. It may reboot while I’m texting, composing emails, browsing or even in a phone call. I always take extra care of this phone and it has never been dropped nor it got wet so I know it isn’t physical or liquid damage. It was after the update that this problem occurred so it must be the OS, right? Is there anything  you can do to fix this problem? — Gibran

Troubleshooting: You didn’t mention how frequent the reboots are but if it happens several times a day, then there are two possibilities. The first being the firmware issue that may have occurred after an update and the second is that the battery already deteriorated and keeps failing causing the phone to turn off and back on again. The good thing is the device still powers up so we can actually do our troubleshooting. Here’s what I suggest you do…

  1. Boot in recovery mode and wipe the cache partition. Let’s rule out the possibility that some caches got corrupted during the update and cause the random reboots.
  2. If the wiping of the cache partition failed, then do the master reset. Backup as much data as you can before doing the reset though.
  3. Lastly, if the reset fails, send the phone in for repair. But if you’re knowledgeable enough, try to flash the stock firmware using Odin and see if that fixes the problem.

Well, I hope this helps.


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