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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2answers
126k 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 ...
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 ...
2
votes
2answers
7k views

What does “Archive does not contain 'android-something.txt'” mean?

So I am trying to flash my OnePlus One with CM12s through fastboot on command prompt, but whenever I type fastboot update romname.zip I am presented with: archive does not contain 'android-info.txt' ...
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 ...
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 ...
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 ...
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. ...
22
votes
6answers
69k views

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 ...
1
vote
0answers
3k views

How to install fastboot drivers? [duplicate]

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 ...
0
votes
3answers
24k views

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 ...
1
vote
1answer
121 views

Wondering if i can debloat some google apps from unrooted lg phone for my father?

My father being older does not want to modify his phone, however he has a LG L70 and no sd card, and doesn't use some unnecessary Google apps, such as play, books, and whatever else. My question is ...
1
vote
1answer
3k 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 ...
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 ...
9
votes
8answers
153k 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 ...
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 ...
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 ...
4
votes
2answers
60k 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 ...
2
votes
1answer
14k 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 ...
1
vote
3answers
9k views

Fastboot permission denied error in Asus Zenfone 2

I went into regular recovery mode to wipe cache and do factory reset to flash clean Asus ROM from XDA. I first went to wipe cache and it felt like it was taking way too long, so I turned off the phone ...
0
votes
1answer
3k views

adb can find device but fastboot cannot

Context I can run adb commands on my Nexus 4 and they work fine but when my device is in the bootloader and I try to list the device with, fastboot devices my device is not listed. I was having ...
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 ...
2
votes
1answer
441 views

Oppo find 7: bootloader re-lock impossible?

I tried to relock the bootloader on my Find 7 (which I'm pretty sure was unlocked since I installed a custom rom). fastboot oem lock ... After that nothing. Windows console is "stuck". Any clue?
1
vote
1answer
5k views

fastboot does not discover my device

I want to connect my device (Omega T107) in fastboot mode. I reboot in bootloader mode (adb reboot bootloader) Screen is black(0 light comming out of it) computer can discover it and driver installs ...
1
vote
1answer
428 views

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 ...
1
vote
1answer
872 views

flashing twrp on lg g4 no error, but no twrp

I'm trying to flash twrp to my lg g4. I've reached the part where I run fastboot flash recovery twrp.img And everything seems to work fine, but when I try to enter recovery mode, I get the default ...
1
vote
1answer
10k 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 ...
0
votes
0answers
2k views

LG G2 “Fastboot mode started”

Hello guys I have flashed Lollipop zip via TWRP successfully (LG G2 D802) but now phone is only booting in "fastboot mode started". I have also tried to repair download mode by following xda forum but ...
0
votes
1answer
341 views

My OS Loads, but no Recovery

Handset: Huawei Honor Holly Root: Yes I am trying to install CWM recovery on this phone. I tried it using Flashify after reading guidelines from a website. Now, my stock recovery is gone. Also, ...
0
votes
0answers
968 views

'fastboot reboot' works but not the other fastboot commands

I know most MediaTek devices don't support fastboot, but I have a Canvas Knight (MT6592) which does reboot into fastboot mode when I use adb reboot bootloader. Here, fastboot devices detects my ...
0
votes
1answer
3k views

“Connect USB Data Cable” message on fastboot screen preventing recovery/reset of Nexus 6

I have a Nexus 6 that doesn't boot after a failed Android M developer preview install (worked perfectly on my Nexus 5). Booting into fastboot via power + volume down shows the device is unlocked but ...
0
votes
1answer
1k views

mounting google nexus s on linux at fastboot mode screen

I have looked at similar questions but could find an answer. Device: Samsung google nexus s i9020 OS: Android 4.1.2 The phone mounts when the OS has loaded and when there is an option to enable usb ...
0
votes
3answers
21k 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 ...