: A RAR (Roshal Archive) file, which is a proprietary compression format.

: Depending on the contents, it usually involves flashing an image to an SD card or replacing specific system files in a LibreELEC installation. ⚠️ Safety Warning

Files with generic numeric names like "21117.rar" shared on public forums can sometimes be mislabeled or carry security risks. Always scan such files with antivirus software before extraction.

: You will need a third-party tool like WinRAR , 7-Zip , or PeaZip to open the archive.