Do not turn off your computer or disconnect from the power source while updating the BIOS as this could harm your computer. During the update, your computer will restart and you may briefly see a black screen.

Before updating, please read the installation instructions and important information noted below.

Dell Inspiron 15 3520 and Vostro 3420/3520 System BIOS

Restart required AUTO INSTALLED This file was automatically installed as part of a recent update. If you are experiencing any issues, you can manually download and reinstall.
This package contains the Dell system BIOS update. BIOS is a firmware package that is embedded on a small memory chip on the system board. It controls the keyboard, monitor, disk drives, and other devices. This update addresses the Dell Security Advisories (DSA). A security advisory is a statement when a security vulnerability impacts a product, and a remedy is available for the vulnerability.
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Fixes & Enhancements

- This release contains security updates as disclosed in the Dell Security Advisories DSA-2023-191, DSA-2024-036, DSA-2023-344, DSA-2023-362, DSA-2023-364, DSA-2023-449, and DSA-2024-030. For more information, see Dell Security Advisories and Notices.
- Fixed the issue where some dots are displayed in the Enter old password field after you change the hard drive or solid state drive password.
- Fixed the issue where the system stops responding during Power-On Self-Test (POST). This issue occurs when the NVMe or Trusted Platform Module firmware is interrupted while updating the firmware.
- Fixed the issue where the system stops responding at the BIOS Auto-Recovery screen when you update the BIOS.
- Fixed the issue where the system reboots repeatedly and stops responding at the Dell Logo. This issue occurs when a system with an NVIDIA graphics card is connected to an 8K monitor.
- Fixed the issue where the Admin Unlock window in the BIOS setup stops responding or the system reboots automatically. This issue occurs when you enter the wrong Master Password in the system password prompt by pressing CTRL+Enter.
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Version

1.22.0, 1.22.0

Release date

19 Mar 2024

Download Type

System BIOS

Category

BIOS

Importance

Critical
Dell Technologies highly recommends applying this important update as soon as possible. The update contains critical bug fixes and changes to improve functionality, reliability, and stability of your Dell system. It may also include security fixes and other feature enhancements.
Available formats View Important Information
File Format: CPG BIOS Executable for Windows/DOS
File Name: Inspiron_Vostro_3420_3520_1.22.0.exe
File Size: 125.5 MB
This is a large file. Depending on your connection speed, it may take some time to download.
Format Description:
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.
To ensure the integrity of your download, please verify the checksum value.
MD5:
a1b7748033d06050c9458306b9d75b36
SHA1:
ace7ab9e2022930819047b8091c8b43fe6c28dbd
SHA-256:
bfb7db71a2a760bc573f9c278f684960f6a21b14495a8e1618a9abed3e8adc09
File Format: BIOS Recovery Image File
File Name: BIOS_IMG.rcv
File Size: 125.49 MB
This is a large file. Depending on your connection speed, it may take some time to download.
Format Description:
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.
To ensure the integrity of your download, please verify the checksum value.
MD5:
79540bba68bd1ca5dc702b489216af2a
SHA1:
3fb777aa9165acb292948173bfc5a8b3896f73c8
SHA-256:
a99f2a05482955243c18bf0373a96aa5fa825b59ed3c9282552d9a92ea98a0ab

By downloading, you accept the terms of the Dell Software License Agreement.

Additional details

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- Once the BIOS is upgraded, you cannot downgrade the BIOS to versions earlier than 1.15.0. 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.
Dell Inspiron V3420/N3520/V3520
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 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.

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. 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 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 progress bar at the Dell logo screen. The system restarts again when the update is complete.

Need help with BIOS issues?

Find a solution in Dell's BIOS troubleshooting and usage guide.

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