ZTE Axon 20 4G (A2121G)

ZTE Axon 20 4G (A2121G) Firmware Flash File Download [Stock Rom]

This firmware is for the ZTE Axon 20 4G (model A2121G), the 4G variant of the innovative Axon 20 series. For users who need to resolve critical software errors, fix a device stuck in a bootloop, or perform a full factory restore, flashing the official stock firmware is the most reliable solution.

Important Note: The filename for this package is incorrectly labeled with “QPST.” The ZTE Axon 20 4G is powered by a UNISOC T618 chipset, not a Qualcomm chip. Therefore, the correct restoration process requires the SPD Upgrade Tool, not QFIL. Following the correct guide for the device’s actual hardware is essential.


Quick Device Specs

Device
ZTE Axon 20 4G (A2121G)
Release year
2021
Chipset
UNISOC T618
Display
6.92″ OLED, FHD+ (2460×1080)
Battery
4220 mAh (Non-removable)
Memory
6GB RAM + 128GB storage
Camera
64MP + 8MP + 2MP + 2MP quad rear, 32MP front
OS
Android 10
Region
Global / Europe / Canada

Required Downloads

File / Tool Download Link
SPD Upgrade Tool Download Tool
SPD/UNISOC USB Drivers Download Drivers

Stock ROM & Firmware

Version Android Region Type Download Size
V1.0.0B07 10 Global / EU / Canada SPD / PAC Download ~2.4 GB

Quick Flashing Guide

  1. Download and install the SPD USB Drivers and the SPD Upgrade Tool on your computer.
  2. Extract the downloaded firmware ZIP file to get the firmware package with a `.pac` extension.
  3. Launch the SPD Upgrade Tool, click the first gear icon to “Load Packet,” and select the `.pac` file.
  4. Power off your phone, then press and hold the Volume Down button while connecting it to your PC to start the flashing process.

For a complete, step-by-step tutorial with screenshots, please refer to our definitive guide:
How to Flash Firmware with the SPD Upgrade Tool


FAQs

Q1. Is this for the famous Axon 20 5G with the under-display camera?

No. This firmware is strictly for the Axon 20 4G (A2121G), which uses a UNISOC chipset and has a standard front-facing camera in a teardrop notch. The Axon 20 5G is a different device with a Qualcomm chipset and its own specific firmware.

Q2. Why does the filename say “QPST” but the guide uses the SPD Tool?

The original uploader of the file made a mistake in the filename. The ZTE Axon 20 4G is confirmed to use a UNISOC T618 chipset, which is only compatible with the SPD Upgrade Tool. Using the correct tool for the phone’s actual hardware is essential for a successful flash.

Q3. What is a `.pac` file?

A `.pac` file is a compressed firmware archive used for devices with UNISOC (formerly Spreadtrum) chipsets. It contains all the phone’s software partitions (like system, boot, recovery, etc.) bundled into a single file, allowing the SPD Upgrade Tool to flash the entire system at once.

Q4. The tool is stuck on “Checking Baudrate.” What should I do?

This is a common connection error. It is usually caused by improperly installed drivers, a faulty USB cable, or not holding the correct boot key (Volume Down) when connecting the device.


Troubleshooting (ZTE Axon 20 4G)

  • PC Not Detecting Phone: This is almost always a driver issue. Ensure the SPD drivers are correctly installed. You may need to disable Driver Signature Enforcement in Windows. Also, try a different USB port and cable.
  • Device Stuck on Boot Logo: The first boot after flashing can take up to 15 minutes. If it is still stuck, you will need to boot into recovery mode (usually by holding Volume Up + Power from off) and perform a “Wipe data/factory reset”.
  • Flashing Fails Midway: This can be caused by a loose USB connection or a corrupted download. Ensure the cable is secure. If it fails again, re-download the firmware file.
  • Network Issues After Flashing: While this appears to be a general international firmware, flashing it on a device from a very different region or carrier could potentially lead to network band incompatibilities.

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