SG S3 not going into download mode

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http://androidforums.com – Hi guys i just bought a Samsung Galaxy S3 from Thailand It has lot of apps in chinese. One of them specially called "QQ Security" is a nuisance I need to remove it cannot So searched the net tried various ways to root the device but was unsuccessful Finally got a step by step process on how to root the device which needs the phone to get into the download mode The method i follow is "From off hold vol down and home then press power" No matter what I do i cannot get into the download mode It gets into recovery mode every single time i try it I read some wh (General)