Firmware files should ideally be verified with a checksum (MD5 or SHA-256) provided by the official manufacturer to prevent "bricking" your device.
Use WinRAR or 7-Zip to handle the extraction. Right-click Part 01 and select "Extract Here"; the software will automatically pull data from Part 03. Download S68AT02 LF1V050 part03 rar
Attempting to open "part03" without the accompanying parts will result in a "Missing Volume" or "Unexpected End of Archive" error. Firmware files should ideally be verified with a