The "repack" version of MTKroot suggests a customized or updated version of the tool, possibly for easier use, additional features, or to support more devices. The version number "v26" indicates a specific iteration of the tool.
This is almost always a driver issue. Reinstall the MTK USB drivers and try a different USB port (preferably USB 2.0). mtkroot v26 repack
: Connect the device to the PC and run the MTKroot application as an administrator. The "repack" version of MTKroot suggests a customized