Please follow the below-mentioned steps very carefully to avoid any data loss and upgrade failure the normal upgrade method and the forced upgrade method.
As the last resort, if your device does not respond to the forced upgrade method then, you need to contact your after-sales service.Īs mentioned above, we will be explaining to you two different upgrade methods i.e. 
Even after this, your phone would not start then, you need to upgrade your device via the forced upgrade method. Moreover, if your device does not reboot after 10 minutes then, you need to perform the upgrade again.
Note that a normal upgrade will take about 10 minutes to complete. Do not perform any other procedure or operations during the upgrade process. Also, do not upgrade your device via the SD card while charging your device. Charge your ZTE device to at least 50% or more to avoid any data loss or upgrade failure. Also, do not change the name or extension of the update.zip file or any of the contents of the upgrade package. Verify that the update.zip file matches the smartphone model of your device. Do not remove the SD card during the update process to avoid any data loss. Now, you need to remove the SIM card, and backup the data and Apps installed on your phone before proceeding with the upgradation method. Make sure that your micro SD card has at least 3GB of free space. Make sure to choose the compatible phone model. Visit the below-mentioned website to download the update.zip package file. Guide to flash Firmware using SD card on any ZTE device Pre-requisites Method 2: Forced Upgrade (For unresponsive ZTE devices). Method 1: Normal Upgrade (Primary upgrade method). Guide to flash Firmware using SD card on any ZTE device.
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