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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20
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6answers
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ADB can discover devices but not fastboot

I've searched on the web about this problem and it's usually solved by installing the appropriate drivers. Problem is I'm on a Mac. When I plug in my device, it can be discovered when I run adb ...
16
votes
1answer
429 views

What's the name of the protocol that android devices use in debug mode?

I have a strange Android prototype what we got from a customer. Said customer has forgotten about it, and I'm now fiddling with it to see if I can make it do anything interesting. The device appears ...
15
votes
4answers
53k views

What does “fastboot oem lock” do?

I've had my phone for months, loading with several firmware, ROMs and OTAs, without ever running this command. What does it do? What I know is that "fastboot oem unlock" displays the confirmation ...
14
votes
1answer
22k views

Android boot-up messages for debugging?

I am trying to figure out if Android (i.e. Galaxy Nexus, Nexus S, and/or Motorola Xoom) come with some sort of capability to produce a "boot-up" log. (kind of like Linux boot-up screen) It would be ...
10
votes
2answers
91k views

Flash boot.img without using fastboot USB

So I've recently rooted my phone and tried a ROM or two. I find it really handy that you can use TWRP recovery to install another ROM from the SD card, you don't need to have it connected to a PC. ...
10
votes
1answer
14k views

Clean way for flashing factory image on Samsung Galaxy Nexus?

Is this the correct and clean way for flashing factory Jelly Bean image on Samsung Galaxy Nexus, without using any external tool (apart from Android SDK)? I don't want to to break my phone, so I'm ...
9
votes
8answers
152k views

fastboot doesn't see device

I've read a lot of articles about this problem but I can't resolve it. I decided to install my developer application on phone using wifi. To do this I need to do some things with my phone. The first ...
8
votes
2answers
32k views

Obtaining root by modifying default.prop(ro.secure)?

To get a privileged shell you need to modify the following lines to the given values in the default.prop file ro.secure=0 ro.debuggable=1 persist.service.adb.enable=1 I have the extracted the ...
8
votes
3answers
5k views

Trying to flash a system.img I took with dd - failing

Long-time UNIX guy here, but relatively new to the world of Android. Read on. EPISODE 1: A New Backup (I hoped) I have recently purchased an Asus MemoPAD (ME103K) ; I then became root, and took a dd ...
8
votes
1answer
7k views

Can I lock the Nexus 4/7 bootloader after flashing a non-stock ROM?

I know that doing a fastboot oem unlock will both unlock the bootloader and wipe the data on the device. Unfortunately, while this allows me to install a non-stock ROM like Cyanogenmod, my ...
8
votes
1answer
13k views

fastboot not working on my Nexus 4

I'm trying to root my N4, and fastboot doesn't seem to work. Running it on linux, and the fastboot binary seems to run. 'Fastboot devices' produces info on my device, but 'fastboot oem unlock' just ...
7
votes
2answers
124k 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 ...
7
votes
1answer
17k views

How to Retrieve SD Card Files via fastboot or recovery?

I have a Nexus 4 (LG E960) running rooted stock 4.2.2/JDQ39. The phone fell from a foot high and the screen cracked. The touchscreen no longer works. I have a full Nandroid (TWRP type) backup under /...
6
votes
1answer
15k views

Boot loop after flashing android 6.0 marshmallow on nexus 5 follow up

this question follows up on this one (but there are many other posts about this topic on the web.. see this reddit post and this xda developers post. I just want to approach this problem in a more ...
6
votes
1answer
5k views

Nexus 10 won't boot after attempted unlock/root

I have a brand new Nexus 10 which is supposed to be a present for my partner for tomorrow. I wanted to have it rooted and set up for her before I gave it to her, so I installed WugFresh NRT on my ...
6
votes
2answers
3k views

nanddump vs fastboot

I have two identical phones. On one of them I've managed to corrupt the system partition and it won't boot. I have fastboot, root (on the one that boots), but I don't have ClockworkMod --- my phone ...
6
votes
5answers
39k views

Installing ROM from Fastboot — Can someone help?

I have a new HTC MyTouch (32A) that I tried to install a new ROM on using ROM Manager. I have done this many times (maybe 100 times), once in a while it goes wrong. Now, with this one, it can't get ...
5
votes
2answers
42k views

Unlock bootloader using fastboot using Ubuntu/Linux

I am trying to unlock bootloader for my HTC Legend. I have ADT (Android SDK according to release 21.1) on my Ubuntu/Linux box. While following the HTCDev instructions to unlock bootloader of HTC ...
5
votes
6answers
21k 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 ...
5
votes
4answers
8k views

Getting Segmentation Fault on recovery

It's an Android 4.0.3. I'm trying to fix my tablet, because it doesn't start anymore. running fastboot devices returns nothing. Then, I'm trying to do that through adb. adb devices returns List of ...
5
votes
1answer
21k 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 ...
5
votes
1answer
722 views

Phone boots very slow and restarts by itself

My problem is when I turn on the phone, the Google logo stays stuck and after unknown minutes boots in with the software animation, but very slow and then starts over again! First a little history of ...
5
votes
1answer
16k views

Problem with unlocking the HTC Wildfire bootloader with HTC unlocker

I tried to unlock HTC bootloader by the official tool but I get to the stage when I issue the command: fastboot oem get_identifier_token Unfortunatly I get error ... (bootloader) [ERR] Command ...
4
votes
4answers
5k views

Anyone have an alternative dowload site for a fastboot binary?

I'm working on rooting my android kernel and most sites list http://android-dls.com/files/linux/fastboot as the place to look for the fastboot binary. However, I've been getting a 404 (Page not Found) ...
4
votes
2answers
59k 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 ...
4
votes
2answers
30k views

Sony Xperia ZR fastboot driver

I am trying to get the fastboot driver for Sony Xperia ZR (dogo) for Windows 7 x64. I found a page with instructions which pointed me to a Sony site where you can download a android_winusb.inf file ...
4
votes
2answers
39k views

Problem unlocking HTC phone using their fastboot program

According to HTC, my Amaze 4G is fully ready from the factory to be queried for its identifier tolken, but when I run the appropriate command, it doesn't work. I get: $ fastboot oem ...
4
votes
1answer
3k views

Documentation/reference for fastboot

Where can I find the documentation for fastboot in Android SDK's platform-tools? I know that running fastboot on its own gives a quick help for the different commands, but I'd like to know about ...
4
votes
1answer
464 views

How to get files off of Nexus 5 Android when LCD Screen + Touchscreen doesnt work?

So I have a Nexus 5 Android 32gb phone that boots up but the LCD screen and touchscreen doesnt work. I know because it gets detected on my computer. Also the bootloader is still locked, which means I ...
4
votes
3answers
6k 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 ...
4
votes
1answer
15k views

Samsung Galaxy S3 with fastboot

I have a Samsung Galaxy S3 (international and unlocked). I recently downloaded the kernel source code from Samsung's website and have successfully compiled and now have a zImage file. My problem is ...
4
votes
2answers
11k views

Extract boot.img

I have pulled boot.img from my phone's CWM backup. How do I extract it? I tried split_bootimg.pl. But throws an error - Android Magic not found in boot.img. Giving up.
4
votes
1answer
965 views

Extracting the radio firmware image from an Android phone

How do you pull radio images off an Android device? Is there any way to do this?
3
votes
3answers
25k 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 [ 0....
3
votes
1answer
5k views

I can FastBoot my device. How can I reinstall an Android image to it?

I accidentally deleted a file from my phone (Sky iVega IM-A800s, Gingerbread) and phone cannot boot now. I'm seeing an "System operating error" and device restarts repeatedly. I could get into ...
3
votes
1answer
2k views

Stock Android on Nexus S - “invalid magic code”

I have a Nexus S (2.3.3, GRI54/I9023, bootloader unlocked, clockworkmod recovery installed, rooted) and I'm trying to flash it with a stock system.img that I built myself (no modifications - yet). To ...
3
votes
2answers
20k views

How to boot into the bootloader when you have ClockworkMod?

I want to upgrade the radio and I'm not sure how to boot into bootloader. When I try to power the phone using VolumeDown+Power, I do get into the ClockworkMod Recovery, but it seems that this is not ...
3
votes
1answer
1k views

Fastboot doesn't see nexus 6p

Currently trying to unlock my bootloader, but cannot get my nexus 6p to determine that it's connected to my PC. I can use adb commands while it's on, but booting it into fastboot mode with the adb ...
3
votes
1answer
1k views

How to hard brick an android phone (Galaxy Nexus)?

I'm trying to figure out whether or not I managed to brick my android phone, a Galaxy Nexus*. Using ClockworkMod Recovery, I pretty much erased everything I could find (/data, /cache, /factory, /...
3
votes
2answers
22k 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 ...
3
votes
2answers
5k views

Can't boot to Clockwork Recovery on Atrix (several methods tried)

I have a Motorola Atrix 4G, with AT&T Carrier. Android 2.3.4 EDIT 11/6/2011: I don't know if this means anything, but I don' have an sdcard in it. I have rooted it using this tutorial. I ...
3
votes
1answer
267 views

Fail to install CM13 on Oppo Find 7a

I would like to install Cyanogenmod 13 on my Oppo Find 7a. I am following the instructions from CM wiki. I am using a laptop with Linux (LMDE2). I fail to install a TWRP recovery. Fastboot seems to ...
3
votes
1answer
125 views

When exactly does the data gets wiped out once bootloader is unlocked?

I've heard as well as experienced that unlocking the bootloader of an Android device wipes the device's data completely, and makes it like the stock one. However, I'm interested in knowing when ...
3
votes
2answers
1k views

How to unlock Nexus S 2.3.3 bootloader without having to wipe all device data?

The usual way is to execute: fastboot oem unlock But this will erase all my private data.
3
votes
1answer
620 views

Galaxy S4 Mini not recognized by Linux in Download Mode

I'm currently trying to root my Samsung Galaxy S4 Mini, so to install CWM, I boot the device into download mode using my Linux Mint 17.2 laptop: $ adb reboot bootloader Now, as intended, my phone ...
3
votes
1answer
16k views

Stuck in Fastboot?! Help please!

I tried to get CM11 on my LG G2 on Bell Canada's network and I really messed it up. I can no longer get into recovery, adb doesn't see my phone, but download mode works (though I have no idea how to ...
3
votes
1answer
5k views

HTC Sensation fastboot unknown device

i want to apologize because i think you get this question a lot, but i experience problems trying to root my HTC Sensation. I turned USB Debugging ON, checked that Fast boot is turned ON in Settings ...
3
votes
2answers
24k views

How Can I Pass Bootloader (Huawei Y200 stuck logo/ Boot-Loop)

I have recently learnt a few things about Android and its system. I have a Huawei Ascend Y200, and I flashed it with ClockworkMod specifically for Y200 with a computer and it worked. I rooted my ...
3
votes
1answer
1k views

Will fastboot not proceed with flashing if battery level is below certain percentage?

I'm trying to re-install Clockwork recovery mod (tl;dr: Android 2.3.1+ will reinstall stock recovery on every boot if it's not present). I had installed it successfully yesterday, but today it does ...
3
votes
1answer
1k views

Erase successful, but not automatically formatting. Can't determine partition type - Jelly bean 4.1.2 with Nexus S

While I ran the command - fastboot flashall -w I got the following error - -------------------------------------------- Bootloader Version...: I9020XXLC2 Baseband Version.....: I9020XXKI1 Serial ...