It is Very important to have the Stock and Official Updates for your Samsung Galaxy S4 E300s Korea, 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 S4 E300s Korea Softwares:
E300SKSUAMDK_SKTAMDK_SKT_Android_4.2.2.zip - 1.9 GB
E300SKSUEMJA_SKTEMJ9_SKT_Android_4.3.zip - 1.8 GB
E300SKSUFNB2_SKTFNB2_SKT_4.4.2.zip - 1.8 GB