
Samsung Galaxy S Ⅲ I9300ZCUBML1 is an Android 4.3 (Jelly Bean) firmware for China (CHN). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. Compared with the previous build I9300ZNUBML1 https://samfirm.shop/build/I9300ZNUBML1, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. A newer build for GT-I9300 is available: I9300XXEMU8 https://samfirm.shop/build/I9300XXEMU8.
Bootloader binary U (30). Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.
Pick your region (CSC) to download the matching firmware package.