If you can tell me or what device you are trying to update, I can help you find the missing parts or the installation manual.
Based on the naming convention ( sc23380 and RSv0704s ), this file is often linked to: sc23380-RSv0704s.part2.rar
: Locate sc23380-RSv0704s.part1.rar and any subsequent parts. The extraction will fail if even one byte is missing from any part. If you can tell me or what device