You may attempt to flash BIOS update using F12 menu with BIOS firmware on a FAT32 formatted USB.
Updating the BIOS from BIOS Boot Menu (independent of operating system)
Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If BitLocker is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com. Note 2: Do not turn off the power or interrupt the BIOS update process during the update. Note 3: Your system requires a restart after installing the BIOS. The restart can be deferred but must be completed to ensure that the update is installed.
Installation 1. Copy the downloaded file to a USB drive. The USB drive does not need to be bootable device. 2. Insert the USB drive into any USB port. 3. Power on the system. 4. At the DELL logo screen, press F12 to access the one-time boot menu. 5. Select BIOS Update in the section. 6. Click Flash from file to browse the USB drive to locate the downloaded file. 7. Select the file and click Submit. 8. Verify the existing system BIOS information and the BIOS update information. 9. Click Update BIOS. 10. Review the Warning message and click Confirm Update BIOS! to proceed with the update. The system restarts and displays a progress bar at the Dell logo screen. The system restarts again when the update is complete.
The Precision 5540 supports the following procedure aimed at eliminating any RTC / CMOS corruption which may be interfering with your '5540's normal operation.
Autodidactic
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June 4th, 2023 04:00
Until someone more knowledgeable finds your thread:
- Which version of the Precision 5540 UEFI / BIOS is your notebook running now and which version did you attempt to update to?
- Did you study the UEFI / BIOS update procedures found in your Precision 5540's documentation?
- Which update method did you employ?
- Did you disconnect all peripherals prior to making the UEFI / BIOS update attempt?
Support for Precision 5540 | Drivers & Downloads | Dell Canada
https://www.dell.com/support/home/en-ca/product-support/product/precision-15-5540-laptop/drivers
Chino de Oro
9 Legend
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8.3K Posts
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June 5th, 2023 15:00
You may attempt to flash BIOS update using F12 menu with BIOS firmware on a FAT32 formatted USB.
Updating the BIOS from BIOS Boot Menu (independent of operating system)
Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If BitLocker is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com.
Note 2: Do not turn off the power or interrupt the BIOS update process during the update.
Note 3: Your system requires a restart after installing the BIOS. The restart can be deferred but must be completed to ensure that the update is installed.
Installation
1. Copy the downloaded file to a USB drive. The USB drive does not need to be bootable device.
2. Insert the USB drive into any USB port.
3. Power on the system.
4. At the DELL logo screen, press F12 to access the one-time boot menu.
5. Select BIOS Update in the section.
6. Click Flash from file to browse the USB drive to locate the downloaded file.
7. Select the file and click Submit.
8. Verify the existing system BIOS information and the BIOS update information.
9. Click Update BIOS.
10. Review the Warning message and click Confirm Update BIOS! to proceed with the update.
The system restarts and displays a progress bar at the Dell logo screen. The system restarts again when the update is complete.
Autodidactic
1 Rookie
•
27 Posts
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June 5th, 2023 17:00
Process of elimination:
The Precision 5540 supports the following procedure aimed at eliminating any RTC / CMOS corruption which may be interfering with your '5540's normal operation.
How to Reset Real Time Clock (RTC) to Recover Your Dell Laptop | Dell Canada
https://www.dell.com/support/kbdoc/en-ca/000125880/how-to-reset-real-time-clock-rtc-to-recover-your-dell-portable-system