[Tutorial] How to flash a new boot.img via Fastboot

First of all you need to have fastboot & adb installed, as well as the drivers for the One S. If you haven't, move on to the second post in this thread!

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If you are on a Sense-based ROM make sure you haven't ticked the fast boot option in the settings!

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Step 0,5
What is the boot.img?
-> basically it contains the kernel & the ramdisk. But let's hear what the pros have to say:

"The boot.img is a small(ish) file that contains 2 main parts, the kernel (the brain of the Android system) and the ramdisk (a core set of instructions and binaries that begins the boot process and controls base aspects of the system, such as mountpoints, memory management and startup services)" Source

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Further information can be found here.

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Do I need to flash the boot.img manually in fastboot?:

• No, if you're using TWRP and are on a Hboot-version lower than 1.13
• Yes, if you're using any other recovery (like CWM)
• Yes, if you're using TWRP and your ville has the Hboot-version 1.13 or higher

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1.Step
reboot your Phone into the bootloader.
This can either be done via
- powering off and keeping volume up & the power-button pressed
- the extended power-menu (If your ROM has it, just select "reboot" & then "bootloader")
- via adb, connect your phone with the pc, make sure it says "USB debugging connected", go to Android/platform-tools/ & then press shift while you perform a right click with the mouse, then choose "open prompt here", type

Code:

adb reboot-bootloader

& press enter. Your One S should then reboot into the bootloader

I personally prefer one of the last two methods, depending which way occurs faster to me at that specific moment.

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2.Step
make sure it says "Fastboot USB" like in the following picture

(Source = Google)

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3.Step
Test if it your device has been detected with the following command:

Code:

fastboot devices

if it gives you an answer other than a blank one or an error there you go

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4.Step
copy the boot.img you want to flash into the folder C:\android\platform-tools\ & then execute the command

Code:

fastboot flash boot boot.img

(if your boot.img is named differently then adjust the last part of the command)
wait for it to succeed.
if it says okay two times & the prompt reappears everything should be fine

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5.Step
reboot your device with

Code:

fastboot reboot

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6.Step
If you want check

Code:

Settings -> About phone -> Kernel

if it matches the boot.img you just flashed

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The whole process should look something like this in your CMD:

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1. Step
download the Android SDK from HERE

Alternatively you can also download the USB drivers & the runtimes for adb & fastboot as a standalone as provided by Inferi0r in the 4th post:

Inferi0r said:

USB drivers only & the adb/fastboot-runtimes only

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[Download carefully, didn't test them for viruses or (mal)function]

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2. Step
Run the downloaded file & change the extracting-folder directly to C:\
(..this will take some time...)
You should then have a folder C:\Android

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3. Step
If you haven't installed the One S' drivers yet, download HTC Sync (e.g. from here, or here) & install it, which will also install the drivers needed for adb & fastboot to work.
If you have them installed already, skip this one & proceed to step 4.

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4. Step
- go to C:\Android again
- press

Code:

Win + R

on your keyboard to bring up the Run dialog
- type in

Code:

sysdm.cpl

and hit OK
- now, the System Properties panel should open. Click on the Advanced tab
- in the Advanced Tab click on Environment Variables
- at the Environment Variables window find where it says Path in the Section of System variables, click on it, and press the Edit button
- when the new window opens, type in

Code:

;C:\Android

at the very end and klick OK
- now close all the windows, that's all, you're done!

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5. Step
- go to C:\Android\platform-tools\ again
- right-click with your mouse while pressing shift
- select "open prompt here" & then you're ready to go to.
- most common adb/fastboot commands:

- adb commands
- fastboot commands
- by entering

Code:

adb help

or

Code:

fastboot help

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