Fix firmware issues with Samsung Galaxy S6 Edge Plus after the Marshmallow update

  • How to fix your #Samsung Galaxy S6 Edge Plus (#S6EdgePlus) that won’t connect to either Wi-Fi or mobile data network after the recent Android Marshmallow (#AndroidM) update.
  • What to do if you device got stuck in boot loop, can’t successfully boot up, boots in recovery mode, and enters Download mode after an update.
  • Learn how to fix a phone whose apps start to crash and features stop functioning after a major firmware update. 


The Android 6.0.1 Marshmallow update has recently been rolled out for the Samsung Galaxy S6 Edge Plus to patch some problems as well as bring some new features to the phone and strengthen security. However, instead of addressing problems previously reported by owners, it seems that the new update brings along new problems to the phone to the disappointment of many of the users.

In this post, I will address some of the issues reported by our readers. So, continue reading to know more about those problems and their respective solutions and/or how to troubleshoot them in case they occur without apparent reason or cause.

Before I answer some questions, if you have other concerns with your Galaxy S6 Edge Plus, visit our troubleshooting page and try to find out if we already addressed problems that are similar to what you have. If so, feel free to use our suggested solutions and troubleshooting procedures. If you need further assistance, however, you may contact us directly by completing this form and hitting submit. Make sure you include all relevant information about the problem so we can provide you with accurate solutions.

Q: “After the update edge feed will not work it says network not available. Will not connect either by Wi-Fi or data connection so streams not working.

A: Apparently, the lack of active internet connection is the cause why feeds don’t work or why they can’t pull updates from their respective servers. That said, you have to address to issues here; first is the Wi-Fi connection issue and the second is the mobile data. You need to fix the WiFi issue first and since it’s an update-related issue, one procedure worth-trying is wiping the cache partition to rule out the possibility that the update messed up the system cache:

  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.

If deleting the system cache didn’t yield any result, then you need to backup your data and do 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.

If this procedure failed as well, then the firmware needs to be reinstalled and you can do so by using Odin but if you’re not comfortable doing it yourself, you need to find a technician who can.

Q: “24 hours after marshmallow update my Galaxy S6 Edge Plus stared rebooting when screen rotated, also I can’t turn phone off or restart when I try this it just reboots . Any help would be great many thanks.

A: Just like the first problem, it might be some corrupt system cache and/or data. So, the right course for this is to wipe the cache partition first. If the problem remains, try to check the Power key to see if it’s stuck especially if the phone can’t boot up successfully before it reboots again. If the power button is fine, then the master reset is your last resort before sending the phone in for repair. Instructions on how to wipe the cache partition and do the master reset can be found above.

Q: “‘CM Security has stopped working’ pop up error constantly with option to OK or REPORT. done this but unable to clear the error. or do anything on my phone. rebooted still no joy.

A: If you can’t do anything with your phone because of the pop up, then boot it in safe mode to temporarily disable all third-party apps including CM Security.

  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.

Once in safe mode, try to clear the cache and data of the CM Security app and boot your phone in normal mode again. If the error still pops up, boot in safe mode again and then uninstall the app.

  1. From any Home screen, tap Apps.
  2. Tap Settings.
  3. Scroll to ‘APPLICATIONS,’ then tap Application manager.
  4. Swipe right to the ALL screen.
  5. Scroll to and tap CM Security.
  6. Tap Uninstall.

It’s up to you if you want to download the app and reinstall it, after all, it might just be a compatibility issue.

Q: “Phone is locked on lube screen saying ” downloading… not turn off target…” and will not stop.”

A: It’s in Odin mode (Download Mode) and it won’t exit that screen unless you do something. Don’t worry, there’s issue with it, just reboot it and you should be able to use it like before.

Q: “I just updated to Marshmallow yesterday. This morning I am having a lot of troubles sending and receiving text messages. I tried using a third party app called Textra, and I am still having issues. Any help would be greatly appreciated.

A: First off, try to see if your phone is detecting cellular signal. You should be able to tell just by looking at the signal bars on the status bar. If it’s not detecting signal, call your provider immediately as it might be a coverage and/or provisioning issue.

If the signal bars, however, indicate the device is getting an excellent reception but without service, try to make a call. If you can, then do the master reset as it’s most likely some settings were messed up during the update. However, if you can’t also make phone calls, you need to call your provider as it’s an issue with your account.

Q: “I bought this Android from a friend and he forgot the Google account linked to it. I’ve followed every step in the video but when i install my OTG cable nothing happens. The screen doesn’t pop up like in the video where I could just click on the by pass application. Please help as soon as possible. Thank you for your time!

A: You may try flashing the firmware to the phone using Odin and a computer. I don’t want to include the steps here so average users may not try to follow them because it’s a risky procedure. So, if you’re savvy enough, you know what I mean, otherwise, let a tech do it for you.

Q: “My S6 edge + was not working properly and was getting restarted again and again the fingerprint scanner was having issues as well so I decided to Factory reset my phone but after the factory reset it does not getting switched on instead on recovery screen showing error that ‘dm-verity verification failed… need to check DRK First.’ I am not sure what i did which was wrong I have saved the full backup of the phone as well earlier.

Can you please help me as to how my S6 Edge+ will get back to normal. Any help is much appreciated. Thanks.

A: First off, try to read this post to see if it can help you. Once you got the idea why this problem occurs, visit this thread. Our friends over at XDA Dev forums found a way to fix this problem.

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2 Replies to “Fix firmware issues with Samsung Galaxy S6 Edge Plus after the Marshmallow update”

  1. S6 Edge Plus is stuck on the “Startup Failed” screen, I’ve tried “Safe mode” “factory reset” everything and nothing worked 🙁 please help

  2. Hi,
    My S6 edge, randomly stopped working, when i turned it on it only showed the galaxy s6 edge restart logo and a corrupted blueish black bricked background and kept restarting over and over till it stopped working and is constantly flashing a bright white led notification which doesnt blink or switch off.. if i touch the power key it begins to restart itself over and over coming to the intial logo screen, i cant even reach the Bio screen by pressing the buttons.. what is this? and how do i solve it?

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