秘密 Confidential▲
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以上所有信息均为中兴通讯股份有限公司所有，不得外传
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All Rights reserved, No Spreading abroad without Permission of ZTE
1) Download the upgrade package that matches the phone model from
ZTE official website (http://www.ztedevice.com.cn/support/), extract
update.zip from the package, and copy update.zip to the root directory
of the SD card (the file name must be update.zip).
2) Select File Manager from the main menu, and verify that the
update.zip file in the root directory of the SD card is proper,
3) Tap and select Settings > About phone > Software updates
4) About a system upgrade before confirmed a total of five, all allowed,
touch SD card update. If there is no SD card inserted in the phone or
no upgrade package saved in the root directory of the SD card, a
message is displayed on the screen: The phone is encrypted. Please
decrypt it or move update package to T-card!.
5) If the upgrade package saved in the root directory of the SD card,
Touch SD card update.
6) Select the updates, screen is displayed,
7) Touch Update the phone automatically powers off and reboots. the SD
card upgrade screen is displayed,
8) After the phone is upgraded, it is rebooted again. After the phone starts
properly, it is recommended to manually restore the phone to its original
factory default settings. The phone is upgraded properly and can be
used.
B. Forced upgrade (for the phones that cannot be started or the phones that
cannot enter standby state)
1) For a powered-off phone, Press and hold the volume up key and
power key until the phone enters Android recovery. In this mode, the
volume key can be used to select a menu, the power key can be used to
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