If this is a firmware or map update for a car, ensure the vehicle is connected to a battery charger or the engine is running. A power loss during installation can "brick" the hardware. Do you have the remaining parts of this archive, or
Usually, "SiMo" refers to SIMOS or Simo related updates, often found in European car navigation or ECU firmware communities.
A .part1.rar file cannot be opened on its own. It is part of a set that requires all other pieces (e.g., SiMo13.part2.rar , SiMo13.part3.rar ) to be present in the same folder to reconstruct the original data.
Download and install WinRAR or 7-Zip .
Ensure the metainfo2.txt file and associated data folders are in the root directory of the SD card, not inside another folder. 4. Safety Precautions