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I had a post on how can I restore the default OS on phone that has custom build? however this got closed because it was a possible duplicate. Unfortunately the duplicate did not answer my question so I am posting again with further details.

Basically I had built the Android source and flashed this to my phone and now I would like to go back to the stock version.

The link in the duplicate points to the following recovery file http://android.clients.google.com/packages/ota/google_crespo/f182cf141e6a.signed-soju-ota-102588.f182cf14.zip

I renamed this to update.zip, and reboot into recovery. I then get a triangle with an exclamation mark. Then I hit the power and volume up key again and see more options, so I then selected 'apply update from /sdcard'.

I receive the error:

 E:failed to verify whole-file signature 
 E:signature verification failed 
 Installation aborted 

How can I restore my phone with stock Gingerbread?

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Explaining why your case is different is perfect :). I didn't see your comment on the other question -- feel free to flag a question and fill in your reasoning if you think a question should be re-opened to make sure we see it. –  Matthew Read Oct 26 '11 at 17:21
    
Thanks! I wasn't sure how to do this (I'm new to android.stackexchange so I may not have enough privileges yet to do this!) –  lost_bits1110 Oct 26 '11 at 17:24
    
Oops, I didn't realize you needed 15 rep for that. I'll have to remember to comment on new users' questions so they can @Matt in their comments. –  Matthew Read Oct 26 '11 at 17:29
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1 Answer 1

It's an official update, so the signature should be perfectly valid. There are a couple things to check:

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Thank-you, I have the GT-i9020T, I tried your first link, ie GTi9020t however I still receive the same error :( I believe my bootloader is unlocked, when I go into the bootloader it says: Lock State - Unlocked. I do not have access to the File Manager to check that it is in /sdcard/, however when I plug in my phone to my PC, I dump the file in the first folder that appears, presumably this is the root of the /sdcard/. –  lost_bits1110 Oct 26 '11 at 18:17
    
@lost_bits1110 That might be the external SD card (/mnt/sdcard/external_sd/) rather than the internal SD storage (/mnt/sdcard/). Samsung devices are weird like that. Both drives should be mounted to your PC though, so try the other one? I'm really surprised you don't have a Files app or anything (is that an AOSP thing?) but you should be able to side-load one, e.g. AndExplorer. –  Matthew Read Oct 26 '11 at 18:24
    
Yes it looks like its an AOSP thing, I wasn't able to find any kind of File Manager type app on here. Also I don't have the Marketplace nor can I connect to a network, so I won't be able to get AndExplorer unfortunately :( –  lost_bits1110 Oct 26 '11 at 18:29
    
Okay - when I connect my phone to my PC and run my Android app, I can open up the DDMS view in Eclipse, and I see the File Explorer. In here I see a folder /mnt/sdcard, and my update zip file is here (though I do not see a /mnt/sdcard/external_sd folder) –  lost_bits1110 Oct 26 '11 at 18:38
    
@lost_bits1110 Hmm. In that case you could try using the fastboot update command via the Android SDK. It's supposed to ignore signatures if you want to risk it. –  Matthew Read Oct 26 '11 at 18:52
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