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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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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1answer
679 views

Installing TWRP on a Samsung device, no fastboot (using ADB or other ways)

My device (Samsung Galaxy S3 I9300) is not detected by fastboot in Download Mode, but it is detected properly by adb. I want to install TWRP as my device recovery. Is there any way to install it using ...
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1answer
2k views

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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0answers
152 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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0answers
1k 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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0answers
96 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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1answer
424 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 ...
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1answer
4k 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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1answer
4k views

No recovery mode .. Stuck in Fastboot mode (RAMDUMP)

i have my cherry mobile Omega spectrum .. i was supposed to reboot my phone after installing a custom i can't find any answers in my group so i decided to post here about this problem anyone here ...
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1answer
13k views

What are all the functions of fastboot on android 4.4.4?

I have recently been able to access fastboot but I have almost no knowledge about the different options inside it. Could someone please explain in details all the functions of fastboot? Extra info ...
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1answer
8k views

Can't flash recovery via fastboot

I have a asus tablet TF300T and I am trying to flash CM11 rom. I am following procedure from official CM pages http://wiki.cyanogenmod.org/w/Install_CM_for_tf300t, but I am stuck with flashing custom ...
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1answer
356 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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0answers
3k views

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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1answer
1k views

Mac OS X fastboot is just waiting (HTC M8 T-Mobile)

I'm trying to run fastboot oem get_identifier_token on Mac OS X Yosemite but I get stuck on "< waiting for device >": ➜ platform-tools ./adb devices * daemon not running. starting it now on port ...
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1answer
20k views

Bricked my TF300T: How to re-partition internal storage to get it back?

I upgraded to Katkiss's Android 5.0 image. It was nice but in reading I saw I could use the F2FS file system to prevent slowdown from normal usage. So I went to format /data thinking that would give ...
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0answers
88 views

Flashed system partition differs subtly from system.img

When I flash my Nexus 7 2013 with a rebuilt aosp system.img using fastboot, the data in the partition (as read back by dd) is very slightly different from the system.img data used to flash it. A block ...
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1answer
2k views

Fastboot flash recovery failed in adroid ZTE kis Q. Several methods tried [duplicate]

I'm trying to root my android using adb from a linux distro. When I run fastboot flash recovery recovery-clockwork-5.0.2.0-blade.img I get > sending 'recovery' (3768 KB)... OKAY [ 0.142s] writing ...
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1answer
1k views

Trying to flash CWM but fastboot hangs at “writing 'recovery'…”

I'm trying to flash my Coolpad 8865u (Vodafone Smart 4 Turbo). I unlocked fastboot and fastboot oem device-info confirms this. However when I try to flash CWM the prompt on my shell hangs at "writing ...
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3answers
24k views

fastboot flash bootloader = FAILED (remote: (InvalidState))

I'm trying to flash bootloader on my Nexus 7 (2012) and getting FAILED: mbp:nakasi-lrx21p alexus$ fastboot flash bootloader bootloader-grouper-4.23.img sending 'bootloader' (2100 KB)... OKAY [ ...
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6answers
20k views

Nexus 10 stuck in bootloop after Lollipop flash no ADB and no Fastboot

So .... I flashed the mantaray-lrx21p image from Nexus Factory Images on my Nexus 10 (16GB Wifi) and it's stuck in a bootloop. No problem, I thought, I can get into fastboot and fix it, right? Maybe ...
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0answers
664 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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3answers
16k views

How to flash root.zip in fastboot

I need to flash the root zip I downloaded from Chainfire without having to install recovery like Clockworkmod. I have fastboot and adb and that's what I used to flash 4.4.4. This is for my Nexus 7 ...
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1answer
4k views

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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2answers
975 views

Tablet listed under adb devices, but not under lsusb while in recovery

I am working with a Gemini devices GEM1000 tablet, I have performed all the steps to get adb working, and the device shows up under 'adb devices' so I go to the bootloader with 'adb reboot bootloader' ...
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0answers
426 views

unlock bootloader Micromax A310

I am trying to unlock bootloader in my Micromax A310. It has MT6592 processor. Whenever I start the mobile in fasboot tmode it got stuck and only shows => FASTBOOT mode ... => FASTBOOT mode ... in ...
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3answers
5k views

Nexus 7 in Fastboot (recovery) not activating USB connection

I realise this is asked countless times but I genuinely believe my question is unique, please bare with me as I explain. My Nexus7 (2013) is not working in fastboot mode, I connect my Nexus 7 and run ...
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0answers
940 views

Unlock bootloader for Lenovo A1000-T

How did you go into fastboot mode? I am not able to figure out. adb reboot bootloader adb reboot-bootloader adb reboot fastboot None of them worked, However adb reboot recovery opens it in ...
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0answers
452 views

Asus Transformer Tab tf300t stuck on asus screen. No ADB, no fastboot, no recovery, no os

I'm very happy with cm11 on my Galaxy s3 so i wanted to try it on my tf300t. First i unlocked the bootloader which i succeeded in doing. Then i flashed clockworkmod recovery via adb. However, when i ...
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1answer
401 views

adb device not found

When I enter ./adb devices I get Device not found. Yet I can successfully unlock my phone via ./fastboot oem unlock. I can't turn on debugging since my phone is stuck in a bootloop and won't start ...
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0answers
309 views

Fastboot doesn't recognize moto g 4g on linux

I have a Moto G 4g. ADB recognizes the cell and I can restart it in fastboot mode, but when I check in the terminal with: fastboot devices Nothing appears, and if I go on with fastboot oem ...
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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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2answers
20k views

FastBoot recovery failed: partition 'recovery' not support flash

My mobile is Lenovo S920 running official Android OS 4.4.2. I am trying to install cwm recovery through fastboot. I tried executing the command fastboot flash recovery recovery.img But I am ...
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3answers
3k 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: Booting into recovery. Connecting to PC via USB cable. Sending the command fastboot -i ...
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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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0answers
2k views

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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0answers
1k views

adb/fastboot can't find device in bootloader, but they can do it when booted

I have worked on building Android from source code for few weeks. It used to be fine to me with my Galaxy Nexus, I can connect to my device via adb and fastboot and flash either the factory ROM or ROM ...
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1answer
179 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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2answers
9k views

TF300t bricked, no fastboot, wrong recovery

I've been running CM11 on my Asus TF300t for a while now. A while ago, an (automatic) update broke my rom. From there on, matters have gotten worse. Right now, my tablet is a brick without an OS. ...
4
votes
2answers
56k views

How to check if your bootloader is unlocked

I'm about to flash a custom recovery, but I'm not sure if my bootloader is unlocked or not (phone is rooted, but I did it a while ago, so I can't remember the process I went with), and I don't want to ...
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0answers
1k views

Blank screen after logo

I was trying to install a custom ROM in a THL T11 from needrom.com. I managed to get into the recovery mode and wipe cache. However, I got somehow into the «ADB» menu and couldn't get out. I pulled ...
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0answers
1k 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 ...
1
vote
1answer
713 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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0answers
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Fastboot command returns a list of question marks

I am trying to root an Acer Iconia Tab A200 tablet using a script. I have adb working and fastboot works too, however, command fastboot devices returns a list of question marks. Eg: ???????????? ...
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1answer
6k 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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2answers
3k views

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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2answers
4k views

Bricked Vodafone smart 2 (Alcatel V860)

I accidentally erased boot and bootloader. download mode nor recovery works and my pc recognize it like Broadcom USB. Any solution?
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1answer
799 views

Enable bootloader screen for Lenovo Vibe Z

I pressed and held volume up key for sometime and my Lenovo Vibe Z is seems to be bricked (not charging or switching on). I would like to get into to the boot-loader screen to factory reset the ...
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1answer
1k views

Meaning of Options in FastBoot Flash Menu

I've just bought my first Android device, a Motorola Moto G. Following the official guide on Motorola website, I learnt about FastBoot Flash Menu. Here there are several options. I'd like to know what ...
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1answer
578 views

Unable to flash recovery image into the device

I am trying to flash recovery image into my HTC Explorer phone. The issue is i keep getting waiting for devices message when issuing fastboot command. the CMD is running with administrative rights ...
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1answer
77 views

GNex factory reset apparently doesn't write anything and I'm not able to update

my gnex (maguro) started rebooting frequently (like every 30 seconds). I hope is not an hardware fault and now I'm trying to restore a factory image so I can rule out any custom rom-derived problems. ...