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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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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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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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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796 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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1answer
260 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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Can I fastboot flash a factory image without flashing the recovery?

Factory Images Using Nexus 9 as an example, the flash-all.bat contains: fastboot flash bootloader bootloader-flounder-3.43.0.0114.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot ...
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94 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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226 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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661 views

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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865 views

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: 1- Booting into recovery. 2- Connecting to PC via USB cable. 3- Sending the command fastboot ...
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1k 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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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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197 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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400 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
888 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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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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672 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
657 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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608 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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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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Device freezes after trying to reboot with bootloader

I have been trying to unlock my bootloader as per the instructions found here. I already have installed the drivers from Google USB driver folder that comes in Android SDK "extras" folder. However, ...
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28 views

How can I enter Fastboot or Recovery mode on the eSTAR X35?

My eSTAR X35 is stuck in a bootloop and I can't reach fastboot mode. How can I get there or into Recovery mode?
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Cannot Upgrade Firmware after Accidentally bricked my Sky Vega IM-A800s

I'm trying to install a custom ROM on my Sky Vega A800s. First I tried to use fastboot to flash the A800S_CWMrecovery_6.0.1.2 recovery image, but when I try to boot my phone into recovery mode it ...
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unable to flash bootloader on nexus 5

LG Nexus 5, LG D820 Andoid 5.1.0 LMY47D Issue: My phone doesn't boot up, it is stuck on the 'flying colors' screen I have done below steps: Wiped data/factory reset on my Nexus 5 fastboot oem ...
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Why am I getting “FAILED (remote: (InvalidSize))” during a fastboot boot flash? [migrated]

I am attempting to install Ubuntu Touch on my first gen Nexus 7, and I keep getting this response when I try to flash the bootloader: saintwacko@Tacitus ~/Downloads> fastboot flash boot ...
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126 views

Flash motoboot.IMG without computer

I need to upgrade my bootloader for lollipop, problem is my laptop is being repaired at the moment... Is there any way I can flash motoboot.img without a computer? I have root, Philz advanced ...
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51 views

Moto G does not turn on after updating to KitKat 4.4.4

I have rooted and unlocked the bootloader on my Moto G. After that, I updated it to KitKat 4.4.4, but it does not power on. Fast boot mode cannot turn on too, I haven't tried anything yet. How to fix ...
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42 views

Update Android on HTC Evo 4G

I have a rooted FreedomPop HTC Evo 4G PC36100 with CyanogenMod 2.6.37.6. My Android version is 2.3.7. Beseband version is 2.15.00.01.15. How can I update Android to the latest version? Is it ...
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82 views

Fastboot devices returns nothing

I have Asus Fonepad 7 dual sim (Build ver. 5.5.1). I want to root my device. adb devices recognizes my device properly. Debugging mode is on. Even device enters in fastboot mode by ...
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1answer
158 views

After updating to 5.1, phone wont get past black “Google” screen

Last night I upgraded to 5.1 via the built-in update functionality. This phone is not rooted. Well, now my phone won't get past the black screen with the white "Google" logo when I try and boot it ...
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1answer
180 views

recovery does not recognise / mount SD card

As reported in an earlier post, I have rooted my HTC Desire Bravo with tacoroot and revolutionary, and my idea was to install a recovery ROM via the SD card. The problem is that neither ClockworkMod ...
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1answer
146 views

ADB is working, fastboot is not (HTC Desire Z)

The adb devices command is working for me, the fastboot devices command is not (Mac OS X Mavericks, SDK downloaded yesterday, phone is a HTC Desire Z): $ sudo fastboot -i 0x0bb4 -p 0x0c91 devices $ ...
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1answer
411 views

Asus memopad7 170C, unlocking bootloader fails

I'm trying too root my Asus memo pad 7 (170C), I've tried EVERY method, using KingoRoot, SuperOneClick, Frameroot, motochopper. None of them worked. So I decided to do the rooting stuff myself, first ...
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Is it possible to unlock the Motorola moto g KXB21.14-L1.41 without official unlock code? [duplicate]

The motorola website for unlocking your boot loader tells me that there are no unlock codes for my phone. Does this mean that this phone cannot be rooted? I refuse to accept that. There must be a way ...
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397 views

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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formatted phone storage. Is phone dead? How to revive?

i booted my android phone to enter into fastboot mode and connected to PC by USB. Then a dialog box appeared to format the disk (internal storage memory i hope). I accidently clicked Format ...
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141 views

Fastboot kernel command line parameters

I wanted to use the recovery.img without actually flashing it in my phone. However, when I give fastboot boot recovery.img or fastboot boot recovery recovery.img in my machine, it shows downloading ...
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115 views

My LGG2 is stuck in fastboot and not showing up on the PC

I have tried to add Cyanogen Mod 12 to my LGG2 and flashed my recovery and now it is stuck in fast boot. I have looked everywhere nobody has an answer the phone does not come up on my computer as a ...
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955 views

Moto g 2nd gen, lollipop bootloader unlock issue

I have just bought Moto G 2nd generation smart phone with 16 gb internal memory. To root device, I tried to unlock bootloader. But it didn't go smooth. When I hit command fastboot oem unlock ...
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176 views

HTC One M8 is stuck on bootloader and won't accept “adb * mods”

I have HTC One M8 that has been rooted, but relocked and S-OFF. I have also tried fastboot flash boot boot.img and then I get this message everytime. sending 'boot' <8624 KB> ... FAILED ...
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159 views

how to flash my memopad me170c without droidboot

i try to flash my device but fast boot recovery bricked now i cant open droid boot or android Os. when i try to power on device an USB logo show in the screen and device powered off in 1 second. in my ...
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61 views

device not loading into bootloader

I am trying to boot my rooted android device into bootloader to unlock it. I have tried following commands but none is working. adb reboot-bootloader adb reboot bootloader Even when trying to ...
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356 views

Fastboot Commands Via Update.zip To Unlock Pattern Lock on Asus Transformer FT201

I purchased an Asus Transformer Prime TF201 a couple years ago. I added a pattern lock on this tablet so our kids would not use it all the time. One of them decied to try the pattern too many times. ...
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Update and then root Infocus M512. Device Found but is offline. Can't enter Fastboot

I am having a really frustrating time updating the firmware on an Infocus M512 as a prelude to then rooting it. I am using the (flawed but usable) how to at this site, ...
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31 views

How to unbrick Nexus 4 after flashing compiled Android?

Today I compiled Android from source as explained following Google's instructions starting at https://source.android.com/source/initializing.html. After flashing the compiled image onto the device ...
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172 views

Get HTC Desire HD into recovery / fastboot / adb with dead volume keys

So my friend tried installing a custom rom on his phone resulting in bricking it. He gave it to me to try to fix it. The phone is a HTC Desire HD with physically broken volume buttons, so I can't get ...
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116 views

LG - Fastboot doesn't recognize my device

I'm trying to get flash a custom recovery on my LG p760, however when I type fastboot devices in the command prompt (while booted into fastboot mode) nothing shows up. adb devices works fine though. I ...