Attempting to upgrade a HP VC FlexFabric-20/40 F8 Module firmware for a HP C7000 chassis fails with "Package Signature: Invalid"

Problem

You’re attempting to upgrade a HP VC FlexFabric-20/40 F8 Module from firmware version 4.45 2015 to 4.62 Feb 2018 (https://support.hpe.com/hpsc/swd/public/detail?sp4ts.oid=6894628&swItemId=MTX_7fae1562133f483abb29f204b7&swEnvOid=4184#):

You download the HP Virtual Connect Support Utility and use the update command to upgrade the firmware but the process fails with:

Error: The signature verification of specified package has failed

Using the packageinfo command on the vcfwall462.bin file returns the same Package Signature: Invalid output:

Downloading the older 4.50 firmware (https://support.hpe.com/hpsc/swd/public/detail?sp4ts.oid=6894628&swItemId=MTX_1f352fb404f5410d9b2ca1b56d&swEnvOid=4184#) and using the packageinfo command display a Package Signature: Valid output:

The Active Onboard Administrator firmware version of the chassis is at version 4.70 May 18, 2017:

Solution

One of the reasons why the upgrade would exhibit such a behavior is if you are using an older version of the HP Virtual Connect Support Utility. In the case of this example, the older version 1.11.1 was used and updating the utility to version 1.13.0 (https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_7df0afcd8cef4984a78f4a888c#tab-history) corrects the issue: