Encryption unsuccessful

I'm at work and I look down and see a screen that says "Encryption unsuccessful" along with a couple of paragraphs basically saying the phone can't access the data (if anyone needs the complete verbiage, let me know). I didn't try to encrypt phone so no idea where this came from. Stock phone, no hacks or anything. The only option is to reset to factory. When I select that, I get a screen with a number of options. They are:

  1. reboot system now (takes me back to encryption unsuccessful screen)
  2. apply update from ADB (Now send the package you want to apply...) - no idea what this is. Had to pull battery to reboot.
  3. wipe data/factory reset (takes me back to encryption unsuccessful screen)
  4. wipe cache partition (takes me back to encryption unsuccessful screen)
  5. apply update from external storage (I have no update to apply. more on this later)
  6. apply update from cache (unable to find an update)
  7. md5 check (does some stuff, reboot to encryption unsuccessful screen)

The phone is a ZTE Sonata 4G with Android version 4.1.2.

Any ideas on how to fix this?



  • sshasansshasan Staff Member United States Posts: 3,699 admin

    This usually happens when the internal memory is corrupted.

    Let me loop in for assistance.

  • npaladin2000npaladin2000 Wappingers Falls, NYPosts: 376

    Did you just configure your work email? Maybe it tried to apply encryption as part of the server security policy.

  • No. Actually, this is my second Sonata 4G that this has happened to. In fact, this one I just plugged into the charger at night when I went to bed. When I woke up, the time was wrong so I rebooted, and it was dead.

  • zte_usazte_usa United States Posts: 176 ✭✭✭✭✭

    Hi, , , is correct. Our devices come with a 12-month warranty, if the purchase of your device is within that time-frame I would reach out to your carrier and discuss options with them.

  • This is an older phone, so no warranty. Is there no way to download something to an SD card to rewrite the OS?


  • sshasansshasan Staff Member United States Posts: 3,699 admin

    That is not something ZTE can provide for a carrier locked device.

  • Thank you for trying to help. Unfortunately, I now have two ZTE paperweights. I hope you understand why I won't buy a third.


  • No offense at all. It is a cheap phone and out-of-date. I did save up and bought a nice LG.


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