The safest and easiest way to update your firmware is through the built-in system settings: from your app list. Navigate to and then select System updates
For the Blade A33 Core, the most common tool is (for MediaTek MT6739/MT6761 class chips) because budget ZTE devices rarely support fastboot flashing commands. Firmware ZTE Blade A33 Core
: Flashing will delete all user data. Back up everything before starting. Drivers The safest and easiest way to update your