SPD refers to Spreadtrum, which is now owned by Unisoc. It is the company that manufactures the SC9863A processor inside the Blade A54. This is important because you will need to use (like the SPD Upgrade Tool), rather than tools designed for Qualcomm or MediaTek devices.
Resolve persistent crashes or "system has stopped" errors. Firmware ZTE Blade A54
Press and hold the button to turn on your ZTE Blade A54. The first boot after a fresh firmware installation can take anywhere from 5 to 10 minutes. Set up your device on the welcome screen. Troubleshooting Common Flashing Issues SPD refers to Spreadtrum, which is now owned by Unisoc
If your ZTE Blade A54 is working but outdated, here is the safe way to update the firmware: Resolve persistent crashes or "system has stopped" errors
Wait a few moments for the tool to fully load the firmware files. The file name will appear in the top bar of the tool once loaded. Step 5: Boot the Phone into Flashing Mode Turn off your ZTE Blade A54 completely.
This method is for advanced users and is necessary for recovering a bricked device or performing a clean installation of full firmware. The ZTE Blade A54 uses a processor, so you need tools designed for Unisoc chipsets, not MediaTek's SP Flash Tool.