New here? READ THIS THREAD FIRST. What Is Recovery & Download Mode?

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pulser_g2

Admin Emeritus / Senior Recognized Developer
Nov 27, 2009
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I'm now going to try and explain some basic concepts of the SGS2, in a very simple way, with illustrations. First of all, a few pieces of terminology.

CWM (Clockworkmod) Recovery Mode:

After flashing a CWM kernel (like CF-Root), you enter recovery with the key combination of Vol Up + Home + Power

device.png


CWM recovery is where you flash ROMs, and other zip files. Use the volume keys to navigate, and the home key to select.

Stock (3e) Recovery (not much use):

Entered with the key combination of Vol Up + Home + Power. Not readily accessible if using a CWM kernel like CF-Root

stockrec.jpg


This is the default Android recovery image. It is of little use other than wiping the data partition via factory reset. If you have this, you are NOT ready to start flashing custom ROMs, and will get various errors until you have recovery showing like in the first picture.

Download mode (for use with ODIN/Heimdall):

Accessible on all phones, regardless of kernel via Vol Down + Home + Power

download.png


This is where you flash tar or tar.md5 files from ODIN on your PC.


Don't mix up these different modes. Each has a different purpose. So now you know what each mode is, and how to get to it. :)
 
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yudi7

Senior Member
May 19, 2011
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Lancaster
Knew that. Though I too had to search for this before, so it's good for the new users. Should be sticky so that people don't ask un-necessary questions of this type before they even search. You could also add many more basics things. I may, also, have something more to learn here.

Good Work Mate.

Edit: Forgot to see download mode.
 
Last edited:

AnDruid

Senior Member
Aug 20, 2009
117
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i would like to make the small suggestion of adding the words "Recovery and Download Mode and other essential things to know" to the thread title (the last bit in case you want to expand on the info later on).
 
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unrealtb

Senior Member
Apr 13, 2011
191
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yo

Thanks for that very helpful. can i ask though what is that cant access system/csc/***/system/ error in recovery e3 all about?
 

cigaro78

Senior Member
Mar 31, 2009
173
9
Great, should be stickied.
I think it could also benefits the newcomers if an explanation was given regarding:
- the fact that ROMs can also include a kernel which contains CWM (wasn't clear to me first time I flashed my SGS2)
- the fact that CWM also comes as part of an app (rom manager) but that ironically you need a custom kernel to reboot in R&D mode (again something I had a hard time understanding at the beginning).
 

CamoGeko

Retired Forum Moderator
Thanks for that very helpful. can i ask though what is that cant access system/csc/***/system/ error in recovery e3 all about?

As I understand, just as a demonstration Pulser was trying to flash a multi-language CSC package in CWM recovery. Which doesn't work.

So please don't try this at home, because your shiny new phone might explode into a cloud of Anthrax.

:D
 

unrealtb

Senior Member
Apr 13, 2011
191
13
I rooted my phone with cf root firmware and then reflashed the stock kernal over the top to get rid of the yellow exclamation mark... thats when i got that system csc error... I just reflashed the cf firmware and are living with the yella ! Until i get a jig. strange.

Also are there any guides on samsung modding... firmware/kernal/rom info. i came from modding my motorola backflip. it was quite simply just flash the rom no firmware kernel etc... so i feel out of my depth a little. any links or help much appreciated :)
 
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CamoGeko

Retired Forum Moderator
I rooted my phone with cf root firmware and then reflashed the stock kernal over the top to get rid of the yellow exclamation mark... thats when i got that system csc error... I just reflashed the cf firmware and are living with the yella ! Until i get a jig. strange.

Also are there any guides on samsung modding... firmware/kernal/rom info. i came from modding my motorola backflip. it was quite simply just flash the rom no firmware kernel etc... so i feel out of my depth a little. any links or help much appreciated :)

Well stock kernel is supposed to be flashed in ODIN (download mode), after you flash that then you can boot to system and use CWM app to flash zImage extracted from CF-Root kernel package. After reboot the triangle will dissapear.

Anyways here is the link to a root guide and stock firmwares:
http://forum.xda-developers.com/showthread.php?t=1075278
 

lek.

New member
Jun 22, 2007
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Hi,

Last night I have upgrade i9100 with wrong version, and now cannot tune on the power and cannot going to download mode again. :confused:


I tried to recovery mode with "adb reboot recovery" but show "Device not found" on PC.

Pls, asvise to me.

Thanks.

[email protected]
 

pulser_g2

Admin Emeritus / Senior Recognized Developer
Nov 27, 2009
19,537
11,597
Hi,

Last night I have upgrade i9100 with wrong version, and now cannot tune on the power and cannot going to download mode again. :confused:


I tried to recovery mode with "adb reboot recovery" but show "Device not found" on PC.

Pls, asvise to me.

Thanks.

[email protected]

If you can't get into download mode, not much here is gonna help you... You tried a jig?
 

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