It is Very important to have the Stock and Official Updates for your Samsung Galaxy Trend 3 SM-G3508, Below you can get the one that suits to your Smartphone, Many versions, Countries, And Languages are available too.
Free Download Links for Samsung Galaxy Trend 3 SM-G3508 Softwares:
G3508ZMUAMI7_CHMAMI7_China_Android_4.1.2.zip - 622.4 MB
G3508ZMUAMK3_CHMAMK3_China_4.1.2.zip - 624.0 MB