Verifying the Downloaded Upgrade File

To verify that the update was successfully transferred to your local computer, compare its checksum against the MD5 checksum information displayed on MySonicWall.

To verify the MD5 checksum of the upgrade file on a PC, use a Windows- or Java-based utility. Microsoft, for example, offers an unsupported command-line utility on their site named File Checksum Integrity Verifier (FCIV).

To compare checksums using the File Checksum Integrity Verifier:

1. At the DOS command prompt, type the following, which returns a checksum for the downloaded file:

   fciv <upgrade_filename>.bin

2. Compare the result against the MD5 checksum displayed on MySonicWall. If they match, you can safely continue with your update. If they differ, try to the download again and compare the resulting checksums. If they still do not match, contact Technical Support.
3. To verify the MD5 checksum directly on your appliance, copy the upgrade file to the appliance and type the following command to see the checksum for the downloaded file:

   md5sum <upgrade_filename>.bin