Firmware ZTE Nubia Z9 Classic

OS: Android v5.0.2 (Lollipop)

CPU: 1.5 GHz, Octa Core Processor

RAM: 3 GB

Display: 5.2 inches, 1080 x 1920 pixels

Battery: 2900 mAh, Li-ion Battery

Before flashing, you need
Create a full backup of the firmware.
The battery must be 100% charged.

1. Flashing your phone using CWM Recovery
2. Flashing the phone using TWRP Recovery
3. Flashing the phone using Fastboot

1. Phone flashing using CWM Recovery
The rich functionality of CWM Recovery www.clockworkmod.com allows you to perform many manipulations with the device, including rolling the firmware. By default, stock Recovery is installed in the devices, which means that first you need to install the ClockWorkMod Recovery utility itself.
The general firmware process described below is for ZIP files. Instructions: - Download the firmware and place it on your phone's SD card.
- Next, turn off your phone.
- Press a specific combination of buttons on the phone body. The set of buttons may differ depending on the phone. If you don't know the combination you want, try pressing the following keys.
- Press the buttons: Volume up (or Volume Down) (+Home) + Power together for a short time.
- As a result, the smartphone will boot in Recovery mode (engineering recovery menu).
- Use the volume buttons to navigate the menu and the Power button to make a selection.
- From the Recovery mode menu select 'Wipe data / factory reset'.
- Use the volume buttons to select 'Yes - delete all user data'.
- Then select 'Wipe cashe partition' from the menu.
- Use the volume buttons to select 'Yes - Wipe cache' .
- Select 'advanced' and confirm your choice with the Power button.
- Use the volume buttons to select 'Wipe Dalvik Cache'.
- Then select 'Yes - Wipe Dalvik Cache' from the menu.
Go back, press 'Go Back'.
- Select 'mounts and storage' and confirm your choice with the Power button.
- From the menu select 'format / system' .
- Then select 'Yes - Format' from the menu.
Go back, press 'Go Back'.
- Highlight 'install zip from sdcard' .
- From the menu choose 'choose zip from sdcard' .
- After that, select the item 'Yes - Install your firmware name' from the menu.
- Select 'Reboot system now' with the volume buttons and press the Power button.

2. Flashing the phone using TWRP Recovery
For those who prefer working with the utility in the form of TWRP Recovery, the following instructions for the step-by-step installation of the update in the form of a ZIP archive are offered:
- Upload the file with the firmware image to the SD card of your phone.
- Go to TWRP Recovery. In the same way as in CWM.
- Perform a factory reset. When finished cleaning the phone, return to the original menu by pressing the 'Back' key.
- In the main menu, select 'Install' and find the previously downloaded firmware image. Click on it by dragging the slider to the side.
- The process of flashing the phone will take about 2-3 minutes.
- Upon completion, the utility will automatically display a message about successful flashing. Click on the 'Reboot System' item, and reboot the device.

3. Flashing the phone using Fastboot
A universal tool for flashing Android smartphones using a PC is the Fastboot utility. It is part of the SDK Platform Tools, which means it is suitable for a large number of devices.
Before starting the firmware, you need to get access to the system kernel. Very often, many manufacturers block this system parameter, not wanting users to change the system files of their firmware images with their own hands. To do this, you need to unblock Bootloader. To do this, you need to study the detailed instructions for configuring and managing the command line. Before starting the firmware using a computer, do not forget to enable USB debugging of the device in the engineering settings of the device.
- Copy the .zip archive with the firmware image to the folder with 'ADB'
- Put your device into fastboot mode and write a prompt in the command line: fastbooflash zip filename.zip.
- Wait for the end of the installation and reboot the device.

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.