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how to downgrade to 4.1.2 official firmware for S3 GT I9300

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(Last edited by rizwan1522; 12th January 2014 at 02:51 PM.) Reason: for more suitable title
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Default how to downgrade to 4.1.2 official firmware for S3 GT I9300

Hello everyone.
I have recently updated my Galaxy S3 GT I9300 unlocked in Pakistan to AOPK kitkat nightly 4.4.2. but its not so good. now i want to downgrade my S3 to previous 4.1.2 samsung official firmware. Can anyone pls help me to downgrade my phone Plz i want to go back to previous firmware.I have read downgrading methods but i cant found official firmware for S3 GT I9300. Plz tell me what to do or help me finding official 4.1.2 firmware. Thankss alott in advance.
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Here is the 4.1.2 official, use odin to flash.

Sent from my GT-I9300 using xda app-developers app
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I've seen the android 4.3 is now with the PDA: I9300XXUGMK7 . Did you try it?
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