Status update, customer worked with Dell Support Team to manually install BIOS using a USB key.   
Today my laptop froze (Latitude 5520) so I had to force shutdown by long-pressing the power button. After booting, a "BIOS Update" dialog box was shown, saying I must update to firmware version 1.20.0. I clicked 'No' and it closed. [IMAGE] I thought to myself that I haven't shutdown nor rebooted my laptop for a very long time so I took this chance that no work was opening to update the Windows. Windows Update installed a few patches and also installed "Dell, Inc. - Firmware - 0.1.21.0" as well. After everything installed, Windows Update prompted me to reboot so I did that and the laptop entered the firmware update screen. It finished without any errors. After Windows booted this time, the same "BIOS Update" dialog box was still showing despite the laptop is already running that version. I thought if I click "Yes" this time, it would realize that the current version is running and the prompt would go away. I was wrong. After clicking "Yes", it rebooted and entered the firmware update screen again, flashed firmware again without error. After booting this time, the dialog box was gone, but I was greeted with Windows notification that I needed to restart the computer after installing BIOS. I checked Device Manager and it has a yellow warning at "System Firmware" and says I have to restart. [IMAGE] [IMAGE]   I restarted my computer again, no firmware update screen this time. But after booting, the same "BIOS Update" dialog box is shown again, prompting me to install the older BIOS. If I click "Yes" here, it will reboot and enter the firmware update screen again and the warning in the Device Manager will be gone, but the "BIOS Update" dialog box will show again. I went through these steps a few rounds now and it's not going away. I have even downloaded the BIOS from Dell Support and installed it but the dialog box is still here. Dell Precision 3560 and Latitude 5520 System BIOS | Driver Details | Dell US I suspect that Dell has its background BIOS checking system and it downloaded BIOS v. 1.20.0 and asked me to install at first which I declined. Then Windows Update installed v. 1.21.0, but the old Dell BIOS update doesn't know this and still want me to install it even though I have a newer version. Please suggest the solution to get rid if this dialog box. Thanks.
"BIOS Update" dialog keeps showing even I have latest BIOS