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How to unroot a samsung galaxy s3
Go to the unlockr website.
Click on the " odin " link located within the section entitled, " downloading required files.
Select the option to save the odin file to your windows desktop.
Go to the samsung updates website at http: // samsung-updates.com/device /? Id = sch-i535. Click on the " download " link to the right of the appropriate firmware version to download the stock firmware for your galaxy s3.