sunethomsen
1 Copper

Precision 5520 loses connection to TB16 after BIOS upgrade

When we upgrade BIOS on Dell Precision 5520 through Windows or as part of our OS Deployment (SCCM), the PC loses the Thunderbolt connection and our OS Deployment fails.

Procedure for OS Deployment
1. PC are connected to TB16 with latest firmware 1.0.0
2. PXE-Boot PC via USB NIC IPv4 with latest Dell WinPE CAB Drivers (A08) injected into boot image.
3. The BIOS will be upgraded as part of our OS Deployment (SCCM)
4. The PC reboot into Windows PE after BIOS upgrade and continues the OS Deployment, but fails.
5. USB NIC IPv4 are missing in boot options after BIOS upgrade
 
Procedure for existing Windows installation
1. PC are connected to TB16 with latest firmware 1.0.0 and drivers (Dell Guide)
2. Suspend Bitlocker protection temporarily
3. Run the BIOS upgrade: Precision_5520_1.10.1.exe /s /f /r /p=XXXXXX
4. USB NIC IPv4 are missing in boot options after BIOS upgrade

After the BIOS upgrade, we can press F12 and confirm that the USB NIC IPv4 and IPv6 PXE boot options are missing in boot options.

BIOS configuration
• UEFI Network Stack are enabled
• Always Allow Dell Docks are enabled
• Thunderbolt Adapter Boot Support and Pre-boot Modules are enabled
• USB Boot Support and External USB Port are enabled
 
The following solutions will work, but are not an option in our environment!

1. If we are using a USB Ethernet adapter during BIOS upgrade, USB NIC IPv4 is available in boot options afterwards.
2. If we press F12 right after BIOS upgrade, enter the BIOS configuration, removing the Thunderbolt cable from the PC and attach it again, press ESC to exit BIOS configuration and press F12 during next boot, USB NIC IPv4 is available in boot options.
3. If you upgrade directly from BIOS (via F12), then USB NIC IPv4 is available in boot options afterwards.

The above are tested on Precision 5530, Precision 7520, Precision 7530, Latitude 7480 and Latitude 7490 connected to Thunderbolt TB16 dock and there are no issues after BIOS upgrade. USB NIC IPv4 is available in boot options and OS Deployment continues, as it should!

This is tested on 4xTB16 Docks with latest firmware and 4xPrecision 5520 with latest Thunderbolt chipset firmware and BIOS version, we also tried to downgrade the firmware and BIOS versions.
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1 Reply
mike65535
1 Nickel

Re: Precision 5520 loses connection to TB16 after BIOS upgra

Have you had any success?

I use dual-boot Win 10 and Fedora 28 Linux.

My TB16 worked fine with my 5530 at first (after the usual twiddling).

Now, after several BIOS and Windows upgrades, the dock is no longer recognized in Windows.  Extended monitor, LAN and USB access do not exist. 

Works fine in Fedora. 

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