Download Android Jelly Bean 4.1.2 stock firmware for Samsung GT-I9100 Galaxy II smartphone from here or here. Download previous firmware from here. Download another Samsung firmware from here.
Firmware details
Archive SAMSUMG I9100 4.1.2 fw
Image: SAMSUMG_I9100_SJJL_ROM_201506016_C.zip
Archive file size: 297 MB
Support: Samsung Exynos 4210
Build number: GT-I9100-user 4.1.2 JZO54K I9100ZSMSA 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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