Upgrading the Phone Software
To upgrade your phone software:
Use the online upgrade tool for mobile terminal products.
Use the one-press upgrade package offered by your mobile
service provider.
Use the upgrade package on your microSDHC card.
NOTE: Visit the ZTE official handset service support
website at:
your country or region to learn more about the upgrade
methods and supported phones and methods.
http://www.ztedevice.com/support
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and click