ZTE Blade A55 Secret Codes & Engineering Test Menu
These are the official service (secret) codes for the ZTE Blade A55, taken from the teardown reference. Technicians use them to check the IMEI and run the built-in hardware test. Type each code in the phone dialer.
The codes
| Code | What it does |
|---|---|
| *#06# | Show the IMEI — compare it with the label, box and certificate. |
| *#*#983#*#* | Open the engineering dialer (a new keypad). |
| *983*673636# | Enable engineering instruction mode (enter this in the engineering dialer first). |
| *983*70# | Run the automatic hardware function test (touch, speaker, vibration, keys and more). |
💡 Open *#*#983#*#* first to get the engineering dialer, then run *983*673636# to unlock engineering mode before *983*70#.
Check the software version
To confirm the installed firmware build, open Settings > About phone > Build number. Match it against the latest ZTE Blade A55 firmware if you are diagnosing software faults or planning a reflash.
⬇️ Need the software? Download official ZTE Blade A55 stock firmware free on ROM Palace — direct links, no waiting queue.
Frequently asked questions
How do I check the IMEI on a ZTE Blade A55?
Dial *#06#. The IMEI on screen should match the one printed on the SIM-tray label, the box and the certificate.
How do I run the hardware test on a ZTE Blade A55?
Dial *#*#983#*#* to open the engineering keypad, enter *983*673636# to enable engineering mode, then dial *983*70# to start the automatic function test.
More ZTE Blade A55 guides
- ZTE Blade A55 Disassembly Guide: Full Teardown Step by Step
- ZTE Blade A55 Battery Replacement: Safe Step-by-Step Guide
- ZTE Blade A55 Screen Replacement: Display Module Guide
- ZTE Blade A55 Common Problems & Troubleshooting (Won’t Turn On, Charging, Signal)
- How to Flash ZTE Blade A55 (Z2450) Stock Firmware (SPD Upgrade Tool) — Fix Bootloop, Unbrick & FRP