Still not received the OTA, then check the instruction to see if you have the OTA update

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How to check Software update on ZTE Maven 3:

If you have the update notification on your AT&T ZTE Maven 3, then hit the DOWNLOAD button to start upgrading your phone to latest software version Z835V2.0.0B10.

[su_note note_color=”#fbc5be”]Before proceeding, please make sure your phone has enough charge of at least 50%, take a full backup before upgrading or downgrading your phone. To download the OTA file, you should be on a stable WiFi connection to enjoy uninterrupted software download.[/su_note]

Once if you have all this, you can proceed with upgrading AT&T ZTE Maven 3 to Z835V2.0.0B10.

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Source: AT&T