Dell just released a new system BIOS version 1.7.3 on April 8 for Dell Latitude 7400. This release is marked as Urgent, and comes with the following fixes and enhancements:

Fixes:

  • Fixed the issue where the Type-C port works from BIOS Boot Menu with external USB port disabled.
  • Fixed the issue that there is no user interface for wireless connection in BIOS Connect cloud SOS interface.
  • Fixed the issue where the system stops responding on Dell logo when SMM Security mitigation and Secure Boot is enabled.
  • Fixed the issue where the system is not able to update the BIOS from BIOS Boot Menu with SMM Security Mitigation enabled.

Enhancements:

  • Enhanced the system firmware auto recovery function when system firmware does not work.
  • Enabled the SupportAssist OS recovery.
  • Updated the Intel Management Engine firmware.

This BIOS update is already avaiable on Fedora 32 (beta) via fwupdmgr tool. Here is how I upgraded it on my work laptop:

# fwupdmgr refresh
Fetching metadata https://cdn.fwupd.org/downloads/firmware.xml.gz
Downloading…             [***************************************]
Fetching signature https://cdn.fwupd.org/downloads/firmware.xml.gz.asc

Successfully downloaded new metadata: 1 local device supported
# fwupdmgr update
• Thunderbolt Controller has no available firmware updates
• SSDPEKKF512G8 NVMe INTEL 512GB has no available firmware updates
Upgrade available for System Firmware from 1.6.1 to 1.7.3
Latitude 7400 must remain plugged into a power source for the duration of the update to avoid damage. Continue with update? [Y|n]: 
Downloading 1.7.3 for System Firmware...
Fetching firmware https://fwupd.org/downloads/353797a2aec44891f83d8c055fcea5c1952f30fd7daf50ce1eecef8802765a85-Latitude_7X00_1.7.3.cab
Downloading…             [***************************************] Less than one minute remaining…
Decompressing…           [***************************************]
Authenticating…          [***************************************]
Updating System Firmware…[     \                                 ]
Scheduling…              [***************************************]
Successfully installed firmware
• Touchpad has no available firmware updates

An update requires a reboot to complete. Restart now? [y|N]:

Restart the machine, that’s it.

References: