34 votes

fastboot doesn't see device

Linux/OSX Run fastboot as root or with sudo. Other OS: credits
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33 votes
Accepted

How can I reboot into recovery from fastboot?

(Self answering here because I only found this answer after hours of dredging through 200 page threads of forum posts.) There are two non-standard but semi-prevalent methods that may work depending ...
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  • 1,845
28 votes
Accepted

can fastboot be used to backup device?

If you check with our fastboot tag-wiki, and follow up the link to the List of fastboot commands, you will see the answer is NO. Fastboot only has commands to write to the device. A few exceptions ...
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  • 89.1k
25 votes

ADB can discover devices but not fastboot

To make the system recognize the Android device, in their several modes, one needs to set permissions for his user in udev. You need to repeat this process of loading Android udev IDs, for every mode ...
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20 votes

Windows 10 Fastboot Driver

By looking at the inf file, you can find that it tells to use the WinUSB driver. So there is a better solution than disabling driver signature enforcement, you can use the tool Zadig (http://zadig....
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  • 346
20 votes

can fastboot be used to backup device?

We can temporarily load a custom recovery fastboot boot <kernel> [<ramdisk>] then backup system partitions
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  • 201
17 votes

Flashing Nexus 5 factory image fails on writing userdata

I encounter the same problem today :) flash-all script failed when writing userdata I have managed to solve this issue by manually continue the flashing process: 1) extract image-hammerhead-m4b30z....
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  • 171
13 votes

fastboot doesn't see device

ADB and fastboot require different USB drivers. Whilst you may see your device under adb when your phone is on it will not be detected by fastboot until you install the driver for it and hence will ...
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12 votes

Fastboot on Samsung devices

Simple... Samsung devices do not support fastboot, you use Odin or Heimdall to flash what you need.
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  • 5,816
12 votes
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Why can't I write to recovery using fastboot on A/B device?

That's expected. Devices with A/B partition scheme don't have a recovery partition. You can only boot in recovery mode with fastboot boot twrp.img. But to permanently flash recovery to device which ...
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  • 17.6k
11 votes
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What fastboot erase actually does?

This thread on XDA has a post ....what is the aim of the "fastboot erase modemst" command? Answer modemst1 and modemst2 are storage partitions for Radio Firmware .... - and it's obviously a ...
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  • 37.9k
10 votes
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Windows 10 Fastboot Driver

I found the solution myself: Windows 10 somehow does not want to install the driver, as it can not verify the manufacturer. So the driver from Sony Developer's site works just fine. After deactivating ...
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  • 309
10 votes

Cannot flash Moto X Style - Due to "Pre-flash validation failed" error

To answer your question specifically: In Moto devices, Preflash Validation Error means the factory image you are attempting to flash is older than the one you have currently installed and Moto devices ...
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  • 5,816
9 votes

fastboot doesn't see device

Issue: adb and fastboot modes for the same Android device are recognized as separate devices under Windows Scenario: the device is visible with adb devices but is not detected with fastboot devices ...
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9 votes
Accepted

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

Details for that can be found in our usb-debugging tag-wiki (where I've just added them): By default, USB debugging is disabled with stock ROMs (some custom ROMs however have it enabled by default)....
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  • 89.1k
8 votes

ADB can discover devices but not fastboot

I had the same problem with InFocus M512, recognized by adb but not by fastboot when in download mode. I've found that specifying vendor ID with -i works (0xID). fastboot -i 0x0489 worked for me.
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8 votes

How to check if your bootloader is unlocked

Assuming your device adheres to some Android standards, you'd want to run fastboot oem device-info. Often you can also run fastboot reboot-bootloader to get into the bootloader which often says right ...
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  • 1,234
8 votes
Accepted

How to flash root.zip in fastboot

Step 1: Unlock the bootloader; fastboot oem unlock This WILL wipe your device. Skip if already unlocked. Set up your device and put SuperSU.zip into it. Step 2: Download the appropriate TWRP/CWM image ...
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  • 479
8 votes

Fastboot poweroff command

There is no Fastboot Command that does this. However you could try holding the power button down until the screen goes blank and then letting go off the power button before the device starts to boot ...
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  • 362
8 votes

fastboot set_active command does not exist

First you need the actual fastboot, e.g. 1.4.3 (from link in the other answer). Then the correct command is: fastboot --set-active=a or: fastboot --set-active=b In the help (fastboot help) you can ...
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  • 397
7 votes
Accepted

What are all the functions of fastboot on android 4.4.4?

Fastboot allows you to send commands to your phone while in the bootloader. The bootloader is the one place that ADB is not running. Disclaimer, not all of these may work with your device. fastboot ...
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  • 22.5k
7 votes
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Trying to flash a system.img I took with dd - failing

Episode 3: Return of the Shell. If I ever had any chance of solving this, I first had to figure out why the shell wasn't working. adbd itself was responding, so it was started on the tablet side - ...
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  • 701
7 votes
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OPO stuck in "Erasing..." while unlocking bootloader

Just reboot the device; at this point there's no harm that can be done since the data was being wiped anyways.
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  • 50.2k
7 votes
Accepted

How to solve Android 7.1 flash failure with remote data too large?

Turns out that some old adb tooling was in my PATH variable, so I was using an old version of fastboot.. It all worked well when I used the right version! Will accept this as an answer in 2 days.
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  • 91
7 votes
Accepted

Unable to run fastboot commands: < waiting for device >

You probably don't have USB drivers installed. Download them and install, everything should work now. Download them from here Download Galaxy Nexus drivers here Power on the device Go to Settings > ...
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  • 3,090
7 votes
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Booting kernel from fastboot

When you use fastboot boot FILE.img, the image is downloaded and written into the RAM and than the normal procedure to boot a boot.img is followed. No changes to any partition takes place. If the ...
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  • 23.5k
7 votes
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How to take full image backup of partitions or eMMC?

Yes you can boot in TWRP if bootloader is unlocked: fastboot boot /path/to/twrp.img Then you can simply dd whole eMMC or individual partitions. You need some extra memory (on external SD card) to ...
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  • 17.6k
7 votes

"Fastboot devices" command doesn't work after macos high sierra 10.14.4 upgrade

This might be a regression in android-platform-tools. Try fastboot version 9dc0875966c0-android from android-platform-tools 26.0.1 as it works for me on macOS 10.14.4
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  • 171
6 votes

How to check if your bootloader is unlocked

i'm no expert, but if you go to the bootloader, by (on my nexus 4) holding volume down then power up, then it says
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  • 480
6 votes
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Installing TWRP on a Samsung device, no fastboot (using ADB or other ways)

There is no fastboot mode on Samsung. You must use the ODIN mode, which is an alternative to fastboot. On Linux there is a client application called Heimdall which talks to phones via Odin mode. So ...
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  • 725

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