ZTE nubia Z9 mini Android 5.02 Firmware Flash File
How To Flash ROM ZTE nubia Z9 mini
Download and install QPST 2.7.422 with QFIL and Qualcomm USB Drivers.
Turn off the phone. Hold Vol+ button and plug-in USB Cable. Phone will vibrate one time, screen wil be black. This is DownloadMode.
There should be device called in device management:
Qualcomm HS-USB QDLoader 9008 (COMXX)
In any other case u have to install drivers manually.
Click Browse… in Programmer Path and choose prog_emmc_firehose_8916.mbn
Load XML in Download Section:
First select RawProgram File: rawprogram0.xml
then Select Patch File: patch0.xml
Check all inputs is correct and click Download under Load XML button and wait about 5 to 10 minutes: