It seems you are looking for a for a device with the model number J260F (Samsung Galaxy J2 Core).
The phrase "j260f root file" combined with "piece" suggests you might have found a partial download or a split archive (e.g., .001 , .002 , .rar ). Do not flash random single "pieces" — this will likely brick your phone. j260f root file
Here is a direct and safe answer: