After the firmware is updated, it will take approximately 15-20 minutes for inventory to run and pull the new firmware/BIOS version info.
If that does not work, delete the device and re-run discovery+inventory.
Last option:
From "Manage -> System updates" page, select "Advanced settings". Select "Enable Downgrades". Wait for 10 mins and select "Disable Downgrades". Check if the firmware version is updated,