Zte Z750C User Manual page 156

Meanwhile, you can also update your phone software through
Storage card updates.
To update your phone software through microSD card:
1. Copy the update package to the root directory of microSD
card. Please make sure the update package has been
renamed to update.zip.
2. Touch the Menu Key > System settings > About phone >
System updates > Storage card updates, then click OK
and choose Update now.
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