Zte Z958 - Upgrade Description and Methods; Normal vs. Forced Upgrade Scenarios

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2) Select File Manager from the APPs menu, and verify that the update.zip
file in the root directory of the SD card is proper, see Figure 2-2.
Figure 2-2
3) Click Home key to return to home screen and subsequently click Settings >
About phone>System updates>Storage card updates. see Figure 2-3.
Figure 2-3
4) Select the upgrade package (update.zip). If the upgrade package is already
saved in the root directory of the SD card, a screen is displayed, suggesting
you to reserve the data in the device, see Figure 2-4. If there is no SD card
inserted in the device or no upgrade package saved in the root directory of