Download Files
File Format: This file format consists of a BIOS executable file. The Universal (Windows/MS DOS) format can be used to install from any Windows or MS DOS environment.
File Name: Dell_Pro_QCT1255_QCS1255_QCM1255_1.4.2.exe
File size: 23.16 MB
To ensure the integrity of your download, please verify the checksum value.
MD5: ad9f7d472a8bd9f722d57e8bed35159d
SHA1: 94fbcae388fb5aceeecefde72b9e4f1cf896e282
SHA-256: 6fbd8cc2c4a3a7f478defa7a69210076aabf08e973721d8065e4604a457e8af8
File Format: This file format consists of a BIOS Recovery image file. This file is used for the System BIOS Recovery process to recover a system from a corrupted BIOS.
File Name: BIOS_IMG.rcv
File size: 23.15 MB
To ensure the integrity of your download, please verify the checksum value.
MD5: 360aef57502339060a26519a8e6de265
SHA1: 089db153c744f2c496cd49cbc793420598e1fcff
SHA-256: 3718411c5fcc1c9ca7b10587c805a25d891ff56c791a94be9302ba2d36d09436
Fixes & Enhancements
Fixes:
- Resolved an issue where the Enable UEFI Capsule Firmware Updates option was not displayed in the BIOS Setup.
- Resolved an issue where a USB keyboard or mouse did not function in the BIOS Setup.
- Resolved an issue where the Dell Premier Rechargeable Wireless Mouse MS900 did not function in the BIOS Setup.
- Resolved an issue that prevented BIOS updates through the exe installer on systems configured with Serial Card and Parallel Card options.
- Resolved an issue where an error message was displayed when enabling DASH Support after the system resumed from modern standby, hibernate, or shutdown.
- Resolved an issue where the system LED remained on when the Integrated NIC option was disabled.
- Resolved an issue where the system failed to boot to the iPXE server when DASH Support was enabled.
- Resolved an issue where Bluetooth was not detected in the BIOS or Onboard Diagnostics after setting a system HDD or SSD password with a WLAN card installed.
- Resolved an issue where the Type C module firmware version was displayed as 0.0.0.0 after updating to BIOS version 1.3.2.
- Resolved an issue where the system failed to boot after setting an administrator password in the BIOS Setup and performing a Real Time Clock RTC reset.
- Resolved an issue that prevented BIOS Recovery after setting an administrator password in the BIOS Setup and performing a Real Time Clock RTC reset.
- Resolved an issue where the system failed to boot and displayed four amber and two white LED indicators on Dell Pro Micro QCM1255 systems.
Enhancements:
- Updated the firmware of HDMI and DisplayPort option modules to the latest version during the BIOS update.
- Enabled SATA hard drive functionality on Dell Pro Tower QCT1255 and Slim QCS1255 systems.
Important Information
- Do not power off the system until the process of updating the BIOS is completed.
- This BIOS contains the new 2023 Secure Boot Certificates.
- Once the BIOS is upgraded, you cannot downgrade the BIOS to earlier versions. BIOS downgrades are restricted when there are security updates and important fixes with earlier versions that impact the functionality of the system.
- BIOS updates take no more than 5 minutes to be installed on your system. You can install the updates in the background while using the system.
Supported Operating Systems
Installation instructions
Updating the BIOS from Windows
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 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.
Download and Installation
1. Click Download File.
2. Click Save to save the file to your hard drive.
3. Browse to the location where you downloaded the file.
4. Double-click the new file.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, system restarts again.
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. You do not need a bootable USB drive.
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 Flash Update in the Other Options section.
6. Click the ... button to browse the USB drive to locate the downloaded file.
7. Select the file and click OK.
8. Verify the existing system BIOS information and the BIOS update information.
9. Click Begin Flash Update.
10. Review the Warning message and click Yes to proceed with the update.
The system restarts and displays a Flash Progress bar at the Dell logo screen. The system restarts again when the Flash update is complete.
Applies to
Dell Pro Micro QCM1255 system BIOS
Dell Pro Slim QCS1255 system BIOS
Dell Pro Tower QCT1255 system BIOS