Get Android Jelly Bean stock firmware for Samsung SM-G3508 Galaxy Trend III smartphone from here or here.
Archive size: 545 MB
Model: Samsung SM-G3508 Galaxy Trend III smartphone
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.