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    [[Zero | Radxa Zero]] > [[Zero/install | Installation]] > [[Zero/install/eMMC_Android | Install Android to eMMC]]

=== How to install Android to Radxa Zero eMMC ===

This guide describes how to install Android to Radxa Zero eMMC. Currently there are two types of Android image that can be flashed on Radxa Zero: Android OTA image, which is a zip archive with multiple smaller img files in it; and amlupdate image, which is just one big img file. Android OTA image is a standard image format that can be flashed by fastboot tool, while amlupdate image is a proprietary format and requires <code>aml-flash-tool</code>. This guide will only cover Android OTA image format. User of amlupdate image should follow [[Zero/install/eMMC_aml_tool| this guide]] instead.

== Requirement ==

* Radxa Zero
* A PC/laptop running Windows, Linux, or macOS
* USB A to C cable or C to C cable, depending on your host
* [https://dl.radxa.com/zero/images/android/ Android 9 image], which should be unzipped after downloading, and you will find files like this in the folder:
    $ ls
    android-info.txt  dtbo.img       flash-all.sh  product.img   vbmeta.img
    boot.img          dt.img         logo.img      recovery.img  vendor.img
    bootloader.img    flash-all.bat  odm.img       system.img
<code>bootloader.img</code> will be needed later to run Zero in fastboot mode. Do not use <code>rz-fastboot-loader.bin</code> as it doesn't have the necessary partition info.

== Windows ==

Please follow [[Zero/dev/maskrom#Enable_maskrom | maskrom guide]] to load extracted <code>bootloader.img</code>. Google driver and nexus-tools are required so don't skip them.

Execute <code>flash-all.bat</code> from your extracted Android folder to flash all partitions to eMMC. Some errors about missing file is normal.

If command line cannot find adb/fastboot, you can add them to PATH variable with <code>set PATH='''YOUR_PATH_TO_ADB_FASTBOOT''';%PATH%;</code> and try again.

You should unplug and replug USB cable after flashing. Otherwise your Radxa Zero will stay in maskrom mode.

== Linux & macOS ==

Please follow [[Zero/dev/maskrom#Enable_maskrom | maskrom guide]] to load extracted <code>bootloader.img</code>. nexus-tools is required so don't skip it.

Execute <code>flash-all.sh</code> from your extracted Android folder to flash all partitions images to eMMC. Some errors about missing file is normal.

If command line cannot find adb/fastboot, you can add them to PATH variable with <code>PATH='''YOUR_PATH_TO_ADB_FASTBOOT''':$PATH</code> and try again.

You should unplug and replug USB cable after flashing. Otherwise your Radxa Zero will stay in maskrom mode.

== FAQ ==
===1. How to erase Android?===
A:

* To erase partitions, first load '''rz-udisk-loader.bin''' in maskrom mode, then run following command:
<pre>dd if=/dev/zero of=/dev/<emmc device> bs=1M count=500</pre>
* [[Zero/install/eMMC_erase | To erase eMMC bootloader]]

=== 2. Why is there no fastboot device? ===
A: If the board not able to run into fastboot, please try:

* If you can boot to android, try "adb reboot fastboot" or (uart console) "reboot fastboot"
* If you can visit U-Boot console, execute command "fastboot"