First, you need to power down the Nextbook. Then, press and hold the power button and volume up button for a few seconds until the manufacturer’s logo appears. Then, release the buttons. Now, press and hold both the power button and volume up button for ten seconds, or until you see the Samsung logo. Now, you should be able to boot up your Nextbook again, but you’ll need to enter the “System Recovery Mode” after this.
Once the system has loaded, the next step is to reboot the Nextbook. You should see the Samsung logo, followed by a menu. Then, select “Reset Device to Factory Settings.” Once you see the menu, choose “Yes, remove all user data and settings.” When the screen turns black again, your Nextbook will reboot itself. Once it starts, you should be able to login to your Google account.
Once you have successfully entered the factory reset menu, the Nextbook will reboot. After this, your device will reboot, and it will be back to the way it was before the error occurred. To do this, press the volume up and power buttons simultaneously until the Nextbook logo appears. Now, press and hold the power button for a few more minutes. After this, you should be able to see the Nextbook logo on the screen. After this, you should press the reset button and the tablet should unlock. Just remember to back up your data before you do this.

Hard reset: If you can’t access the security menu, you can do a hard reset. This can solve the problem by letting you enter your password again. Once the system has been hard reset, you can access your settings again. If you can’t remember it, you can try the password recovery process, but this will wipe out all your data. In case you don’t know the password, you can do a soft reset, but this is not recommended.
To restore all of your previous data, hard reset your Nextbook tablet. Before you hard reset your tablet, make sure the SD card is in the tablet. This will allow you to reset the tablet and try again. If the password is correct, the device will automatically boot up. If not, try to change the settings on the tablet. You can do it by resetting it again. You can also remove the SD card.
If all else fails, you can try a soft reset first. If the battery is removable, do a factory reset. Then, use Fastboot or ADB to reload the system image. This method is not recommended for a damaged device. But if it works, the battery may be the culprit. If it is not, it’s time to contact the manufacturer of your tablet. If you want to try the method, follow the steps below.
If none of these methods work, you can always try a factory reset. This is a good solution if your tablet doesn’t recognize the computer. Then, try to wipe the caches. This will clear the caches and clean the system. Delete all the applications on the device, and then try the hard reset. Once you’ve done this, you’ll be able to boot it up properly.
To enter the “Safe Mode” mode, turn off the tablet. Then, hold the power button until you see the manufacturer’s logo. Once you’ve done this, press the volume down button and press the power button to execute the command. Then, select reboot. You’ll be in the recovery menu. The tablet will now be restarted. Once it is in this state, you can continue the steps.
If the above steps fail, you can try a factory reset on your tablet. Then, hold the power and volume UP buttons for 5 seconds. This will boot the tablet into “safe mode” and let it boot into the factory. From there, you can try to reboot the tablet and see if the problem has been solved. When it’s ready to be used again, it’s time to reboot.