Because repacks are technically derivative works, they live in the shadows. Do use random "ROM download" websites (they contain malware targeting banking apps).
For the , "repacking" usually refers to creating or using a modified version of the stock firmware or a custom ROM to improve performance or update the Android version. Below are the details for available custom ROMs and the necessary tools for flashing. Popular Custom ROMs for SM-T113 samsung t113 custom rom repack