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[Tips & Tutorials] [Mods' Insight] Understanding Recovery mode & Download Mode

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56702 23 |
10:12, Jan-15-2014 | From PC
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Go to reply no.
This post was edited by Iyengar 16:56,Jan-17-2014

Section I - Recovery Mode:

Introduction

The purpose of this guide is to help users understand how to use the default Android System Recovery that is installed in the Andoid Device. Note that if you have already installed a custom recovery image such as Clockworkmod Recovery (CWMR) or Team Win Recovery Project (TWRP) this will overwrite the stock default Android System Recovery. This guide will teach you how to access recovery mode, and how to use all the features of the default Android System Recovery.

Short Brief

What is recovery?  
In Android, recovery refers to the dedicated, bootable partition that has the recovery console installed.  A combination of key presses (or instructions from a command line) will boot your phone to recovery, where you can find tools to help repair (recover) your installation as well as install official OS updates.

How to Access Recovery Mode
Recovery mode can be accessed in one of two ways by pressing a key combination or using adb. When you enter recovery mode the recovery options menu will be hidden and you will see an Android lying on it's back with a red triangle exclamation point. To show the recovery menu simultaneously hold the Power Button + Volume Up buttons.

Key Combination Method
The first way of accessing recovery mode is by pressing a key combination simultaneously. For the Nexus 10 recovery mode can be accessed by simultaneously holding the Power Button + Volume Up + Volume Down buttons. To show the recovery menu simultaneously hold the Power Button + Volume Up buttons.

ADB Method

The second way of accessing recovery mode is by issuing the following ADB (If you don't know what ADB is you can learn more about it here) command:
  1. adb reboot recovery
Copy the Code
To show the recovery menu simultaneously hold the Power Button + Volume Up buttons.

Using the Recovery Menu Options
When the recovery menu appears you will be presented with a menu selection that appears similar to this:

Android system recovery

Volume up/down to move highlight:
power button to select.

------------------------------------
reboot system now
apply update from ADB
wipe data/factory reset
wipe cache partition
------------------------------------
The volume up and volume down button can be used to highlight different options and the power button can be used to confirm your selection.

Reboot system now

The reboot system now option will exit recovery mode and reboot the device normally starting the normal Android operating system.

Apply update from ADB

The apply update from ADB option allows you to sideload a stock Android update to your device using ADB without the need for root access or a custom recovery (Note: You will need a custom recovery to flash a custom ROM, custom kernel, or other modifications, this only meant to apply official Google updates).

Prior to using the "apply update from adb" option you must make sure you have installed the device relevent USB drivers, installed ADB, and made sure "USB Debugging" is checked under developer settings within Android. Once you have done these things from ADB issue the following command:
  1. adb sideload <path/to/update.zip>
Copy the Code
Where path/to/update.zip is the location on your computer that the update file is stored at and update.zip is the name of the file. An example using adb to sideload an update:
  1. adb sideload xxxxxxxxxx.zip
Copy the Code
After you enter the sideload command the file should transfer to your device and once it is done transferring it will begin the update process. Once it has completed the update process, reboot your device.
  1. Wipe data/factory reset
Copy the Code
The wipe data/factory reset option erases the contents of /data partition as well as the /cache partition. This will erase any apps, pictures, music, data etc. you have stored on /data partition in addition to erasing the /cache partition. This will not erase your /system partition.
  1. Wipe cache partition
Copy the Code
The wipe cache partition erases the contents of /cache partition. Wiping the /cache partition is one common way of fixing a bootloop.

Sample CWM Image to understand the Topic

Recovery-Mode.jpg



Section II - Download Mode:

Short Brief

Download Mode is the mode that you boot your phone into on Samsung devices when you want to flash firmware through Heimdall or Odin.
Some roms have "Reboot to Download Mode" in there power menu, and some do not. For those that do not, read on.

What is Download Mode?

Download Mode is one of the many modes the bootloader can start in. Others are "recovery mode", "charging mode", I have also seen an "Upload Mode" but I don't know much about it. Then there is the normal android system boot mode for normal use.
Download Mode is a way to flash any image on the devices OneNand (flash) or EMMC (internal sdcard).
You cannot flash MTD images in download mode. This is because the bootloader does not know about mtd or yaffs2 (that is known of). It only seems to support BML/STL images. So the cleanest way to get to mtd is to flash a bml kernel, then flash an mtd rom(with mtd kernel) from the bml recovery. The mtd rom should support upgrading from bml.

How to get into Download Mode?

FIRST METHOD (easiest/most common)
1) Power phone off
2) Plug USB into computer
3) Hold vol up + vol down
4) Plug USB into phone while still holding the vol up and vol down
5) Yellow /_\ (triangle, Downloading, Andy shoveling, Do not turn off Target!!! symbol)
Your now in Download mode

SECOND METHOD
1) Power phone off
2) Plug USB into Computer
3) Plug microUSB into phone
4) Hold pwr + vol up + vol down
5) When Batt icon goes away, release pwr, still holding vol up + vol down
6) Yellow /_\ (triangle, Downloading, Andy shoveling, Do not turn off Target!!! symbol)
You should now be in Download mode.

THIRD METHOD
1) Power phone off
2) Pull battery out
3) Hold vol up + vol down
4) While holding vol up + vol down, plug in USB cable into the phone
5) While still holding vol up + vol down, put battery back in
6) Yellow /_\ (triangle, Downloading, Andy shoveling, Do not turn off Target!!! symbol)
You should now be in Download mode.

FOURTH METHOD (adb)
1) Enable debugging on your phone (Menu>Settings>Applications>Development>)
2) With phone on, plug USB into computer and phone
3) Open cmd
4) Type in "adb devices" (not totally necessary, but I always do it just to make sure everything is good), making sure it recognizes your device
5) Type in "adb reboot download"
6) Yellow /_\ (triangle, Downloading, Andy shoveling, Do not turn off Target!!! symbol)
You should now be in Download mode.

A sample image to understand:


Downloade-mode.jpg


Conclusion
If the contents of this guide have been helpful to you and that you have enjoyed this how to .

Source: Google Search, XDA, Forums, Friends, past experience.
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Awesome work!

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