Fastboot & Rescue Mode  What is it? + How to Enter and Exit ▷ 2020

Fastboot & Rescue Mode is a protocol what can be used to modify flash partitions on your device. In addition, with this function you can also update the file system on mobiles Android, among other things.

We will show you below what is Android Fastboot and what it is for. We will also show you all the actions you can do with this command for mobile phones and what options are available to you.

If you want to know how to use Fastboot & Rescue Mode on a Huawei, Samsung, Motorola, Xiaomi or HTC, continue reading because you will find the step by step for each one.

What is Android Fastboot & Rescue Mode and what is it for?

What is Android Fastboot & Rescue Mode and what is it for?

The Fastboot & Rescue Mode is a tool native operating system Android and is used to modify filesystem images. For this, you need to enter from a computer that is connected through a USB port. This function is used to quickly update the firmware without having to use a recovery mode.

This rescue mode can be launched on your device before Android loads, even under the circumstance that Android is not installed on the mobile. Fastboot & Rescue Mode is also used to erase partitions and override command line options in the kernel. Many people are confused with ADB, the difference is that the ADB runs within the operating system, while the Fastboot does not need it.

The F&RM used to perform manual updates or do a root in the team. Another difference that you have between these functions is when the phone enters boot mode. In this mode, the ADB It will not help you because you do not have access to the operating system, whereas you can do it with Fastboot.

What kind of actions can I perform from the Fastboot of my Android?

What kind of actions can I perform from the Fastboot of my Android?

We will show you below all the actions that you can perform using the Android Fastboot commands:

Update or install OS

This is one of the best known actions of Fastboot, for this you will need to have the ISO operating system or updates you want to add. You have to consider that both the device drivers and the package for Fastboot you must have them on your PC beforehand.

Unlock Bootloader

This bootloader that works before Android loads can be unlocked, but it is a bit more complicated than the previous function due to the impediment to enter the OS. As with the installation of the operating system, here you will also need to have the mobile disks and the package of Fastboot.

Other actions

To use Fastboot you will have to follow this syntax “Fastboot [ <opción> ] .

Within the options you can find:

  • -b : returns the address of a kernel client.
  • -c : When you need to override a command line in the kernel, you will have to use this function.
  • -i : provides equipment identification.
  • -l: delivers the device path.
  • -n : It uses the default size 2048, but if you want to know the size of the nand you will have to use this option.
  • -p: it is useful to know the product number.
  • -S : it does not take into account files larger than the indicated size.
  • -s : It is used to specify the serial number of the mobile.
  • -or: When you don’t want to delete the partition before formatting the device, you will have to use this option.
  • -w: used to clear user and cache data.

As for the Fastboot & Rescue Mode commands, you can use the following:

  • boot [ <ramdisk> ]: serves to download and boot the kernel.
  • devices: delivers a list of all connected devices.
  • erase : erase a flash partition.
  • flash [ <filename> ]: you will have to use this function when you need to write a file to a partition.
  • flash: raw boot [ <ramdisk> ]: if you need to create a boot image and then flash it, you will have to use this tool.
  • flashall: when you want to clean flash everything, you are going to have to use this command.
  • format : formats the partition.
  • getvar : It is used to see some specific element in the bootloader.
  • reboot: restart the Android mobile.
  • reboot-bootloader: just like the above command, but it restarts it in bootloader.
  • update : you will be able to flash the Android mobile from the file name,

Steps to enter and exit Fastboot & Rescue Mode of Android

The first thing you should know is that you must erase all internal memory of your device. And second, you will likely lose your factory warranty or the team’s telephone company for tampering with the software. Another thing to keep in mind is that not all phones have a fast boot mode that can be accessed. For this reason and before continuing you will have to make sure that your mobile has Fastboot & Rescue Mode.

You will also need to have the Android SDK (Software Developer Kit) and different USB drivers to order according to the operating system you have. Below, you will find a quick guide on how to use Fastboot in Android according to the brand from your mobile.

Let’s see:

On Huawei

On Huawei

To enter Fastboot, you must press the Lower volume and connect the USB cable. When the screen appears Fastboot release the key. If you want to exit Fastboot you just have to press the button Power for about 15 seconds.

On Samsung

On a mobile Samsung you can also activate the mode Fastboot by means of a combination of keys. You must turn off the device, then press the buttons Startup, Power and Volume Down at the same time until the screen appears Fastboot. To exit is much easier, you just have to restart the phone. In case this does not work, remove the battery from the mobile, wait a few seconds and turn it on again.

On Motorola

If you want to enter Fastboot you must turn off the device. Then press the buttons at the same time. Power On and Volume Down until you see the Fastboot. To exit this tool you must use the command Fastboot Reboot. Which is at the end of the command list. The phone will go through the whole process and restart automatically.

On Xiaomi

On Xiaomi

When you want to enter Fastboot in a Xiaomi, you must first enter developer options. For this go to the phone settings, then System and click About of the phone. There look for the build number and press it until it gives you developer permission. Usually you need to press 7 times.

Once you have the developer permission you will have to turn off the mobile. Press the stop key at the same time. Power On and Volume Down Until appears Fastboot. To get out you just have to restart the computer, pressing the button To turn off for 15 seconds. The phone will reboot and work normally.


To enter Fastboot you must turn off the equipment. Then press at the same time the Power and Volume Down until you see the screen Fastboot. If you want to quit Fastboot, you must use the command Fastboot Reboot at the end of the commands you have run.

If you have any questions, leave them in the comments, we will answer you as soon as possible, and it will also be of great help to more members of the community. Thank you! 😉

You may be interested:

Rate this post

Leave a Comment