Download Android Jelly Bean 4.3 stock firmware for Samsung I9300 Galaxy S3 version A from here or here. Download previous versions from here.
Firmware details
Archive name: SAMSUNG_I9300_4.3_20160301
Image: SAMSUNG_I9300_SJJL_ROM_20160301C
Archive file size: 549 MB
Support: Exynos 4412 QUAD
Build number: m0zn-user 4.3 JSS15J I9300ZNUBML1 release-keys
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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