Fastboot is a protocol used by Android to diagnose and flash new firmware images on an Android devices via USB. It is part of the Android Debug Bridge (ADB).

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Get into fastboot mode without root or hardware buttons

I own a relatively unknown Chinaphone, the CUBOT GT72+ (MTK6572 SoC) - on which I was attempting to gain root access. No known exploit-based root methods exist for this device (which runs on Android ...
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OS X Yosemite - Nexus 5 - ADB Device Offline

I've been trying to initiate ADB commands on my Nexus 5 using my MacBook Air. However, when I type adb devices into Terminal, my Nexus 5 is listed as offline. I've tried disabling/enabling USB ...
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fastboot oem unlock: hangs with `…'

First of all, I am a newbie to Android. I am using Ubuntu Gnome 14.10 to run all the commads. I am trying to unlock the bootloader of my Lenovo A536 (stock Android 4.4.2 aka KitKat). Here is what I ...
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1answer
208 views

LG Optimus G fastboot not working

Alright, I have an LG Optimus G that I'm playing around with and trying to install ubuntu on. I'm following this guide I've done everything up to the point where you enter this into the terminal: $ ...
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Nexus 5 stuck on boot loop after restarting while upgrading the OS

Last week, I received an update on my Nexus 5 for Lollipop 5.0.1. Version 5.0 was working fine, so I decided to just update. However, a few hours after updating, my phone started to lag and freeze, so ...
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301 views

Recover data from non-booting Android

I have an HTC Once Mini that will not boot. It has stock firmware on it (no root, no replaced bootloader, no custom recovery, just plain old stock HTC firmware). It will start to the bootloader and ...
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2answers
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does flashing a kernel ever wipe anything on the phone? + Doing it without CWM?

does flashing a kernel ever wipe anything on the phone? and is it ever dependent on android version? e.g. 4.22 or 4.3 I have CWM and i've seen the option to install from zip within CWM recovery. ...
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How to detect if bootloader is unlocked when fastboot doesn't work?

I have this tablet that runs on RK3168 (Rockchip) SoC. The problem is that fastboot doesn't recognize the device, but after so much toil, I managed to find Finless' flashing tool and flashed CM ...
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996 views

Rooting note 3 - fastboot not unlocking or detecting

I have been reading so much trying to find the answer to this problem, but I can't find any. I am not quite sure what to do at this point. I am running XUbuntu and I am trying to to root my SM-9005 ...
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1answer
567 views

HTC One X hangs at bootscreen, repair centre writes it off

..so am I screwed or what? I was running the ViperX ROM on my One X, based on 4.2.2, and a couple of days ago I started getting FCs on HTC BlinkFeed, even though I wasn't using it. I rebooted into ...
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Fastboot: Lock state - Locked on nexus 7

I am having trouble unlocking the bootloader on my Nexus 7. When I boot into fastboot I see the message LOCK STATE - LOCKED. I want to unlock the bootloader so I can re-install the stock operating ...
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How can I recover from flashing broken ROMs on my HTC One X?

I am seeking your help to clear up some of my confusion in solving a problem with my HTC ONE X. I tried flashing a custom ROM on my HTC Android phone but all the files and partitions got messed up ...
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OS X utility to create stock images

Before I spoil my new HTC One. I needed a little help with the following Create a backup of the recovery Create a backup of the system Create a backup of anything that maybe required to bring the ...
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1answer
2k views

Possible to flash factory ROMs on an encrypted phone using fastboot?

I have the storage on my Nexus 4 encrypted using Android's built-in encryption feature. I'd like to update to 4.4 using one of the factory images provided by Google. If I follow the standard script ...
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476 views

Desire HD: I apparently flashed the wrong pd98img.zip, how can I fix this?

in a attempt to downgrade my Desire HD from 2.50 to 1.32 I apparently pushed the wrong pd98img.zip into my zip card. I can start the phone, but I'm greeted by some chinese characters and can't do ...
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1answer
8k views

Clockwork: error: cannot load 'recovery-clockwork': No error

I am trying to flash a recovery-image file into my Nexus 7 but the flashing fails know that I am working on windows and my image file is located in the same folder as adb and fastboot files are ...
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2k views

Unbrick HTC Desire

This is my output of fastboot getvar all (bootloader) version: 0.5 (bootloader) version-bootloader: 6.93.1002 (bootloader) version-baseband: 5.17.05.23 (bootloader) version-cpld: None (bootloader) ...
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Failed to get_identifier_token from HTC Desire HD with fastboot

My HBoot is HBOOT-2.00.0027, I got the following problem when I was trying to unlock my HTC Desire HD following the instruction http://www.htcdev.com/bootloader It seems HBOOT 1.0 has this problem ...
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481 views

How to recover Samsung Galaxy Fit using software that works on Ubuntu?

I tried to install the new Jelly Bean on my Samsung Galaxy Fit, but it got stuck during installation with an error on /tmp/slideloadpackage.zip. Now, my original Android OS lost. How can I recover ...
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Is there a way to boot to the fastboot mode?

I booted to the TWRP recovery for the first tiem and played with it by wipping everything using all the wipe options. Then I ended up unable to boot to the fastboot mode, normal mode or recovery mode. ...
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1answer
476 views

Android PandaBoard: Linux terminal output for debugging?

My research team is currently considering investing in a PandaBoard for Android b/c we are developing a custom kernel/sys-image and would like Linux terminal output. Does the Pandaboard give me ...
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795 views

Boot custom kernel via phone

I can currently boot a custom kernel (without flashing it) for test purposes by using fastboot on my computer via: cmd> fastboot boot customkernel.img Which works great. I've found great kernels ...
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How to install fastboot drivers?

I have a cheap clone android (benss b3) that I managed to connect to win 7 by editing the .inf file in usb drivers. Now I want to load different ROMs via fastboot. However, when I boot to fastboot ...
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Samsung Galaxy S3 I9300 is not detected by fastboot under Ubuntu 14.04

When I connect my device in Download mode to my laptop, it is not detected by neither adb nor fastboot commands: fastboot devices and sudo fastboot devices returns nothing when device is connected ...
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1answer
5k views

Fastboot flash bootloader fails

I tried to install CM11 on my Nexus 10. But, I wasn't able to install the boot.img with fastboot (Rooted, CM11 flashed with Clockworkmod recovery): [root@xx temp]# fastboot flash bootloader boot.img ...
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Htc one m7 International not recognized in adb mode

I have an htc one m7 running bootloader hboot 1.56. I unlocked the bootloader via htcdev.com The bootloader now shows Unlocked My phone is recognized in adb when the phone is turned on. But when i go ...
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1answer
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Is it possible to unlock the bootloader without root access?

Is it possible to unlock the bootloader without root access? If so, is there another way to unlock the bootloader without using the command... fastboot oem unlock Now, for the background stuff ...
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1answer
805 views

Recovery from fastboot

I have a Sanyo Zio that is completely non-functional but for being able to get into fastboot. Two questions: 1) I gather that the answer to this problem generally is to install a boot.img from ...
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2answers
306 views

Fastboot poweroff command

Is there a way to shutdown my Mate7 from fastboot? Long pressing the power button makes the phone restart again. I need to shut it down so I can recharge it then restore to stock.
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2answers
5k views

How to enable USB Debugging in Android if forgotten pattern for screen-unlock?

I want to use some third party software to clear my device's screen unlock pattern which I forgot. They require USB debugging enabled but I don't have it enabled in my Android. How do I turn on USB ...
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1answer
521 views

adb does not reboot my Samsung Galaxy SIII I9300 to bootloader (download) mode!

My device is Samsung Galaxy S3 I9300 and I did a complete factory reset. Device is NOT rooted yet. It works properly. I can do all of following with my device: Power off using device keys. Start ...
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3answers
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Is it possible to run fastboot in a recovery mode shell (without connecting to PC)?

I have a method for unlocking the bootLoader of my HP SlateBook x2 running Android v4.3 consisting of: Booting into recovery. Connecting to PC via USB cable. Sending the command fastboot -i ...
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1answer
131 views

Fully Wipe Nexus Device

I have a Nexus 7 2013 WiFi-only (flo) device. I rooted it and just generally messed around with it. Now I want to put it back to complete stock everything (bootloader, recovery, ROM, etc) AND ...
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3answers
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Trying to restore photos from a broken S4 (AT&T), how do I go about it?

My friend broke her S4's screen, and wants to get back the photos from the internal memory. The phone does not have USB debugging turned on, so having it attached to the computer only charges it. The ...
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1answer
264 views

Prevent unauthorized image flashing

I wonder whether there is a way to prevent someone to use fastboot to flash an Android device. Indeed, while one must be able to turn on USB debug in order to run adb, the bootloader does not offer ...
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2answers
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fastboot flash = FAILED (remote: invalid bootloader image)

After breaking CyanogenMod on my Nexus 5 I want to flash it with a factory image but all I get is: fastboot flash bootloader bootloader-flounder-3.43.0.0114.img sending 'bootloader' (2970 KB)... OKAY ...
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2answers
2k views

Fastboot doesn't recognize Nexus 5 on L

I recently flashed the dev preview of android L on my Nexus 5, however, I did what is called a "dirty flash" - I just used TWRP and flashed the image as if it was a normal ROM. The result is that it's ...
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1answer
2k views

Operating system in a phone having no OS

I have sony xperia P and i was trying to install custom ROM in my phone.I copied the boot.img in the boot partition.Now my phone doesn't starts. There is no external SD card slot in my phone. How ...
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1answer
202 views

Enter fastboot commands from an Android phone

I want to do the following without a PC, just directly from an Android phone using a script / Android Terminal: Reboot into bootloader, and then enter a few fastboot commands Is this possible?
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1answer
481 views

Fastboot setserial command

I noticed that a lot of descriptions of fastboot mention a command named setserial which not available in the current version that comes with Android SDK. You can see the complete list of commands ...
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1answer
924 views

My Kindle Fire is stuck at the yellow triangle screen after installing TWRP. How can I fix this?

I followed the instructions on the official TWRP site on how to install TWRP on the Kindle Fire. So I did wget <twrp.img> adb shell idme bootmode 4002 fastboot -i 0x1949 flash recovery ...
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2answers
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HTC Wildfire won't boot

My HTC Wildfire will not boot up. When I boot normally with the SD card in, I only get a screen that says "Fastboot" with the options bootloader, reboot, reboot bootloader and power down. It says to ...
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1answer
698 views

Droid2 Fastboot

How to get the droid 2 to enter fastboot? Running rooted phone, CM7 nightly 239 Power + x gets me recovery Power + Up gets me bootloader
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1answer
677 views

Nexus S downgrade with Clockwork Mod

I have a Sprint Nexus S 4G running ICS Cyanogenmod 9. I want to run 2.3.6. In CWR I've backed up, wipe/erased, wiped Calvik cache, but when I go to install my Sojus 2.3.6 file I get Installing ...
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1answer
617 views

Where does the Fastboot pull the information from?

I have a Motorola Xoom MZ601 but which is a GSM Wifi model. 3G on Xoom is not wokring currently. So I tried to debug the problem and when I did Fastboot getVars I got following info ...
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1answer
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downloading 'boot.img' while using fastboot to copy ra recovery

In the process of attempting to get Cyanogen MOD onto my HTC Hero. I rooted it successfully, and can connect with ADB. I restarted the phone with the back key held down and get the fastboot screen. ...
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Y300-0100 Hard Brik

I Have Huawei Y300-0100. And i cant go to recovery. Just fast boot and adb. And update screen (boot loader). I unlocked it before and now i cant lock it because i got invade key or image ...
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1answer
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dtb not found error

am trying to boot philz_touch_6.55.0_dior.img in my xiaomi redmi note 4G through the andRoid debug bridge to my phone but when I write the command " fastboot boot philz_touch_6.55.0_dior.img " I get " ...
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1answer
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my phone won't reboot from fastboot mode it keeps coming back to fastboot mode

I wanted to flash recovery.img in my phone but I accidentally flashed boot.img and now my phone is stuck in fastboot mode.
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1answer
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Relock Y300 Bootloader

I have hauwei Y300-0100. I unlocked Bootloader Of My phone before for root it. Now i want to flash my phone with stock rom but i cant. I tried to lock my phone with fastboot but i gave an error: I ...