The safest method is via the phone's settings. Go to Settings > System > System Update to check for and download official ZTE software updates .
This comprehensive guide provides everything you need to know about finding, downloading, and installing the stock firmware for the ZTE Blade A55 (Z2450). Whether you are dealing with a boot loop, software glitches, or a bricked device, this article will walk you through the process of restoring your phone to its factory state. ZTE Blade A55 Firmware Link & Complete Flashing Guide
You will need a Windows computer to execute the flashing process. Ensure you have installed the so your computer can recognize the phone in download/fastboot mode. ZTE Blade A55 Firmware Link & Tool Details
Flashing firmware wipes all data from your device. Ensure your phone is charged to at least 50% before starting. Step 1: Prepare Your PC and Device Install the on your computer.
ZTE provides a Support & Download page where users can find user manuals and service manuals.
Installing the stock firmware (the official software that came with the phone) can fix all of these issues. Stock ROMs are device-specific and are not interchangeable between different phone models.
Shifts your operating system to a preferred version.