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SAMSUNG GT-I9300

(GALAXY S ?) DOWNLOAD FIRMWARE: I9300XXUGMK6

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Firmware Details:
Model: GT-I9300 / GALAXY S ?
PDA/AP Version: I9300XXUGMK6
CSC Version: I9300OLBGML1
Bootloader/ BL: I9300XXUGMK6
Region: THL / Thailand
Carrier/Brand: OPEN
OS: Android / Jelly Bean
OS Version: 4.1.2
Build Date: N/A
Security Patch Level: N/A
Changelist: 2168382
CRC: NULL
Size: N/A
DOWNLOAD FIRMWARE SAMSUNG I9300 Galaxy S III

This firmware also works for:

You will download the app that will download the latest version of the firmware. Why should you use this app instead of download directly?

How to flash your phone with the new firmware?  How to update SAMSUNG device? How to change firmware in your device?

Click here to read the article about installing downloaded software