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 you are interested in and place it on the phone's SD card.
- Turn off your smartphone.
- Depending on the phone manufacturer, press a specific combination of buttons on the phone body. 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.
- The phone will then boot into Recovery mode.
- Use the volume buttons to navigate the menu, and use the Power button to select.
- Select 'Wipe data / factory reset' from the menu and press the Power button.
- Select 'Yes - delete all user data' from the menu and press the Power button.
- Then select 'Wipe cashe partition' from the menu.
- Select 'Yes - Wipe cache' from the menu and press the Power button.
- Then select 'advanced' from the menu.
- Select 'Wipe Dalvik Cache' from the menu and press the Power button.
- Then select 'Yes - Wipe Dalvik Cache' from the menu.
Go back, press 'Go Back'.
- Then select 'mounts and storage' from the menu.
- Select 'format / system' from the menu and press the Power button.
- Then select 'Yes - Format' from the menu.
Go back, press 'Go Back'.
- Select 'install zip from sdcard' .
- Choose 'choose zip from sdcard' from the menu.
- After that, select the item 'Yes - Install your firmware name' from the menu.
- Select 'Reboot system now' from the menu.

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 device's memory.
- Go to TWRP Recovery. This is done according to the model with CWM.
- Perform a factory reset. When finished cleaning the phone, return to the original menu by pressing the 'Back' key.
- From the main menu select 'Install' and find and select the firmware file. Click on it by dragging the slider to the side.
- The flashing process 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 the prompt in the command line: fastbooflash zip filename.zip.
- Wait until the end of the installation and reboot the device.

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Firmware Asus ZenFone Go 4.5

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