Same problem here, have you found a solution?

Looks like everything is fine, although the BIOS version remains the same.

**************************************************
***Dell Firmware Update started on 6/23/2022 at 13:20:25***
Command: C:\Program Files (x86)\DesktopCentral_Agent\patches\1410732-Latitude_5X00_Precision_3540_1.17.1.exe /s /l=bios-upd.log /f

SMB Table Address:13ea4a8:1a52
WSMT Supported: Using WMI commands.
Registry creation is Success at \SOFTWARE\DELL\FirmwareUpdate
Dell Firmware Update Utility Version: 4.2.19


------------------------------------------
Gigabit Ethernet : Current Version:BCD:A00: --- New Version:BCD:A00
System BIOS with BIOS Guard: Current Version:BCD:1.16.1: --- New Version:BCD:1.17.1
Embedded Controller : Current Version:BCD:1.0.22: --- New Version:BCD:1.0.22
Backup Embedded Controller: Current Version:BCD:1.0.0: --- New Version:BCD:1.0.0
Intel Management Engine (VPro LP) Update: Current Version:BCD:12.0.85.1869: --- New Version:BCD:12.0.90.2072
Main System TI Port Controller 0 : Current Version:BCD:20.0.0.5: --- New Version:BCD:20.0.0.5
Bios Connect Exe Payload: Current Version:BCD:0.1.16.0: --- New Version:BCD:0.1.16.0
Bios Connect Exe Version: Current Version:BCD:0.1.16.0: --- New Version:BCD:0.1.16.0

------------------------------------------
Located the dedicated image or no dedicated image requested for this system.
/f command-line is used. Do RBU

Exit Code = 2 (Reboot Required)
***BIOS flash finished at 6/23/2022 at 13:21:19***

Previous attempt:

**************************************************
***Dell Firmware Update started on 6/20/2022 at 10:43:03***
Command: C:\Program Files (x86)\DesktopCentral_Agent\patches\1410732-Latitude_5X00_Precision_3540_1.17.1.exe /s /l=bios-upd.log /f

SMB Table Address:154a4a8:1a52
WSMT Supported: Using WMI commands.
Registry creation is Success at \SOFTWARE\DELL\FirmwareUpdate
Dell Firmware Update Utility Version: 4.2.19


------------------------------------------
Gigabit Ethernet : Current Version:BCD:A00: --- New Version:BCD:A00
System BIOS with BIOS Guard: Current Version:BCD:1.16.1: --- New Version:BCD:1.17.1
Embedded Controller : Current Version:BCD:1.0.22: --- New Version:BCD:1.0.22
Backup Embedded Controller: Current Version:BCD:1.0.0: --- New Version:BCD:1.0.0
Intel Management Engine (VPro LP) Update: Current Version:BCD:12.0.85.1869: --- New Version:BCD:12.0.90.2072
Main System TI Port Controller 0 : Current Version:BCD:20.0.0.5: --- New Version:BCD:20.0.0.5
Bios Connect Exe Payload: Current Version:BCD:0.1.16.0: --- New Version:BCD:0.1.16.0
Bios Connect Exe Version: Current Version:BCD:0.1.16.0: --- New Version:BCD:0.1.16.0

------------------------------------------
Located the dedicated image or no dedicated image requested for this system.
/f command-line is used. Do RBU

Exit Code = 2 (Reboot Required)
***BIOS flash finished at 6/20/2022 at 10:43:57***


************************************************** 

Hello, I see you are looking for technical assistance. If you need our help, you can start a private/direct message with us and we will be happy to assist you.

Hi 

We trying but dont have resolutiob for this.

Other models working fine.

This support say, we must update devices by USB key LOL GREAT HELP.

Having the same issue with loads of 7420, BIOS 1.21.0

**************************************************
***Dell Firmware Update started on 12/5/2022 at 9:15:20***
Command: C:\ProgramData\Dell\UpdateService\Downloads\FOLDER09096327M\1\Latitude_7X20_1.21.0.exe /s /l="C:\ProgramData\Dell\UpdateService\UpdatePackage\log\Latitude_7X20_1.21.0.txt" /p=

SMB Table Address:b7b908:18a4
WSMT Supported: Using WMI commands.
Registry creation is Success at \SOFTWARE\DELL\FirmwareUpdate
Dell Firmware Update Utility Version: 4.2.53

------------------------------------------
System BIOS with BiosGuard: Current Version:BCD:1.20.0: --- New Version:BCD:1.21.0
Intel Management Engine Corporate Firmware Update : Current Version:BCD:15.0.42.2235: --- New Version:BCD:15.0.42.2235
Integrated Sensor Hub: Current Version:BCD:5.4.1.4456: --- New Version:BCD:5.4.1.4456
Embedded Controller : Current Version:BCD:1.0.18: --- New Version:BCD:1.0.18
Backup Embedded Controller: Current Version:BCD:1.0.0: --- New Version:BCD:1.0.0
BiosConnect Core FV : Current Version:BCD:2.19.2: --- New Version:BCD:2.19.2
BiosConnect Wireless FV: Current Version:BCD:2.19.2: --- New Version:BCD:2.19.2
Intel TBT Retimer : Current Version:BCD:0.2.17: --- New Version:BCD:0.2.17
Intel TBT Retimer 2 : Current Version:BCD:0.2.17: --- New Version:BCD:0.2.17

------------------------------------------
Located the dedicated image or no dedicated image requested for this system.

Exit Code = 2 (Reboot Required)
***BIOS flash finished at 12/5/2022 at 9:16:11***

In last BIOS we have problem on 3410 and 5400 this Dell is real unusable for enterprise.

Did you ever find a solution to this?

No. I open ticket to dell, and this end with "take USB and update it if this work its OK".

This dell support is real pain.