Before downloading anything, look at the sticker on the bottom of the device. You need to match the Hardware Version (e.g., V1.0, V2.0). Installing a V1.0 firmware on a V2.0 device will brick it.

Visit the ZTE Support Download Page or your provider's Drivers and Software section.

Official firmware for ZTE devices can generally be found on the ZTE Support Download Portal

Only download files from reputable community members, as unofficial firmware can sometimes contain malware or hidden scripts. Are you looking to unlock the box for third-party apps, or are you trying to fix a software error