This write-up provides an exhaustive breakdown of what firmware means for this specific device, where to find official versions, how to flash (install) them, common issues resolved by firmware updates, and critical warnings for the end user.
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Use the SPD Upgrade Tool (also known as ResearchDownload or FactoryDownload) rather than SP Flash Tool, which is for MediaTek devices. Firmware ZTE Blade A33 Core
ZTE_Blade_A33_Core_MTxxxx_8.1.0_XXXXX.zip or ZTE_Blade_A33_Core_SP_Flash_Tool_Firmware.rar This write-up provides an exhaustive breakdown of what