Press and hold the button (on some variants, it may require holding both Volume Up and Down simultaneously).
Plug the USB cable from the PC into the phone while holding those keys.
Go to recovery mode and perform a "Wipe Data/Factory Reset."
While holding the Volume Down (or both volume buttons, based on the video instruction), connect the phone to the PC via USB cable. zte blade a55 firmware link
Download Pandora Box or SPD Upgrade Tool .
As of 2026, finding official, direct-download, full-package firmware can be tricky. Often, community-backed are more reliable than outdated official support pages. ZTE Blade A55 (Z2450) Stock Firmware Dump (Android 14)
If your phone is stuck on the logo or failing to update, a hard reset may be necessary before attempting a full re-flash: ZTE Blade A55 - Full phone specifications - GSMArena.com Press and hold the button (on some variants,
Download SPD Upgrade Tool (ResearchDownload) and SPD USB Drivers .
ROM Provider – ZTE Blade A55 Z2450 Firmware This source is well-regarded in the mobile repair community for providing official firmware files. The package for the Blade A55 includes the ROM file itself, as well as essential tools like the Spreadtrum Upgrade Tool and USB drivers.
For more specific, up-to-date information, you may want to visit ZTE's official support website to see if they have released the official package there. Download Pandora Box or SPD Upgrade Tool
: Since the Blade A55 uses a Unisoc (SPD) chipset, manual flashing typically requires the SPD Upgrade Tool (also known as ResearchDownload) rather than SP Flash Tool, which is for MediaTek devices.
Because the ZTE Blade A55 utilizes a Unisoc chipset, standard Android tools like SP Flash Tool (which is for MediaTek) generally will not work.
Extract the SPD Upgrade Tool and run the .exe file as an administrator.
Finding the correct firmware link for your ZTE Blade A55 is crucial for repairing software glitches, fixing bootloops, or updating your operating system. Using the wrong stock ROM can permanently damage your device. This guide provides official download links, necessary preparation steps, and a complete flashing tutorial. Official ZTE Blade A55 Firmware Download Links