You can download the Samsung SM-G530T stock ROM using any of the reliable free Samsung firmware update tools. There only used to be one reliable firmware update tool for Samsung called SamFirm. However, the developer stopped maintaining it. Since then many forks of the original SamFirm tool have been born. And luckily they were because there are many people always downloading Samsung firmware using these tools. Most of them do the same thing which is to download the Samsung firmware directly from Samsung”s servers. There is no need for any middleman in this process which ensures you get the firmware file you need.