The ZTE Blade A7s 2020 (model `A7020`) is a popular entry-level smartphone known for its simplicity and affordability. It is powered by a UNISOC (formerly Spreadtrum) chipset, which means it requires a specific set of tools and procedures for flashing firmware. If your device is stuck in a bootloop, has software errors, or you need to bypass the Google Factory Reset Protection (FRP) lock, you've come to the right place.
This guide provides the official stock ROM for the Telcel Mexico (`TEL_MX`) variant and a complete, step-by-step tutorial on how to flash it using the standard SPD Upgrade Tool. This is the definitive method for restoring your ZTE Blade A7s 2020 to its original factory condition.
Why You Might Need to Flash Your ZTE Blade A7s 2020
Flashing the stock ROM is the ultimate solution for a wide range of software problems.
Quick Device Overview
Required Tools & Downloads
Download the firmware and the essential tools for flashing UNISOC/SPD devices.
Flashing Method: Using SPD Upgrade Tool
This is the standard procedure for flashing firmware on UNISOC/Spreadtrum devices.
➡ You can now unplug your phone and power it on. The first boot will take longer than usual.
Troubleshooting & Common Errors
This guide provides the official stock ROM for the Telcel Mexico (`TEL_MX`) variant and a complete, step-by-step tutorial on how to flash it using the standard SPD Upgrade Tool. This is the definitive method for restoring your ZTE Blade A7s 2020 to its original factory condition.
- ✔ A guide specifically for the UNISOC (Spreadtrum) powered ZTE Blade A7s 2020
- ✔ Download links for the official firmware and all necessary flashing tools
- ✔ A complete method to unbrick your device or bypass the FRP lock
- ✔ Device-specific troubleshooting for common SPD flashing errors
Why You Might Need to Flash Your ZTE Blade A7s 2020
Flashing the stock ROM is the ultimate solution for a wide range of software problems.
- Unbrick a Bricked or Bootlooping Device → If your phone is stuck on the ZTE logo or fails to power on correctly, a firmware flash is the most effective repair.
- Bypass Google FRP Lock → If you've factory reset your phone and are stuck on the Google account verification screen, flashing the stock ROM is a common method to bypass this lock.
- Remove Viruses and Malware → A full flash completely wipes the device, eliminating any malicious software that may have been installed.
- Fix Software Glitches → Resolve issues like apps crashing, the phone freezing, or features not working correctly by restoring the original, stable software.
- Return to Stock for Warranty or Sale → Restore the phone to its untouched factory state.
Quick Device Overview
- Model: ZTE Blade A7s 2020 (A7020)
- Release Year: 2020
- Chipset: UNISOC SC9863A
- Display: 6.5” HD+ IPS LCD
- OS: Android 10
- Codename: P963F50
CHIPSET WARNING: This device uses a UNISOC (Spreadtrum) processor. The flashing method is completely different from Qualcomm (Snapdragon) or MediaTek phones. You must use the specific tools and drivers listed below.
Required Tools & Downloads
Download the firmware and the essential tools for flashing UNISOC/SPD devices.
| Tool / File | Purpose / OS Version | Download Link |
|---|---|---|
| SPD Upgrade Tool | The official tool for flashing `.pac` firmware files. | Download R26 |
| SPD SCI USB Drivers | Essential for your PC to detect the phone in flash mode. | SPD Driver Pack |
| Stock ROM (Mexico) | Official Android 10 (`.pac` file) | ZTE_Blade_A7S_2020_V1.6 |
Flashing Method: Using SPD Upgrade Tool
This is the standard procedure for flashing firmware on UNISOC/Spreadtrum devices.
- Install Drivers: First, install the SPD SCI USB Drivers on your PC. You may need to restart your computer after installation.
- Extract Tools and Firmware: Extract the SPD Upgrade Tool and the downloaded firmware `.zip` file into separate folders on your desktop. The firmware file will be a single large file with a `.pac` extension.
- Launch SPD Upgrade Tool: Open the tool folder and run the `UpgradeDownload.exe` file as an administrator.
- Load Firmware: Click the first gear icon ("Load Packet"). Navigate to the extracted firmware folder and select the `.pac` file. It may take a minute to load.
- Start the Flash Process: Click the third button, which looks like a "Play" icon ("Start Downloading"). The tool is now waiting for the phone.
- Connect Your Phone: Power off your ZTE Blade A7s 2020 completely. Now, press and hold the Volume Down button, and while holding it, connect the phone to your PC with a USB cable.
- Wait for Completion: The tool will detect the phone, and the progress bar will start filling. Do not unplug the device. When the process is finished, it will show a green "Passed" message.
➡ You can now unplug your phone and power it on. The first boot will take longer than usual.
Troubleshooting & Common Errors
- Tool is Stuck on "Checking Baudrate": This is the most common issue and is almost always a driver problem. Uninstall and reinstall the SPD drivers, try a different USB port (USB 2.0 is best), and make sure you are pressing the boot key (Volume Down) correctly before connecting the phone.
- "Invalid PAC File" Error: This means your firmware download is corrupted. Download the `.zip` file again and make sure it is fully extracted.
- Phone Doesn't Connect: Ensure the phone is completely powered off. Some ZTE models may require holding both Volume Up + Volume Down buttons as the boot key.
- Flash Fails in the Middle: This can be caused by a faulty USB cable or port. Try a different cable. If it fails repeatedly on the "system" partition, it could indicate a hardware failure of the phone's eMMC storage.
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