(e.g., an update, a drop, or rooting attempt), I can give you more specific advice on which tool or firmware version you might need. How to Unbrick ZTE Blade A34?, How To - HardReset.info
Before attempting more invasive procedures, try these non-destructive steps to see if the device can self-correct. Force Restart (Soft Reset) If your phone is stuck on the ZTE logo or a black screen: : Press and hold the button for 10–15 seconds. How To Unbrick ZTE Blade A34
Unbricking can erase data and may void warranty. Proceed only if you accept risk. or rooting attempt)
: Launch the UpgradeDownload.exe tool on your PC. How To Unbrick ZTE Blade A34
Release the button as soon as you see a "Downloading" progress bar appear in the tool. Step 5: The Flashing Process