Dell Inspiron 14 5435/16 5635 and Vostro 16 5635 System BIOS

Restart required

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.

hi testing

Driver Id : RH5GN

Importance : Critical

Version : 1.21.0, 1.21.0 Latest version Recommended version Latest and Recommended version

Release Date : 10 Mar 2026

Download Type : System BIOS

Category : BIOS

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.

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: Inspiron_5435_5635_Vostro_5635_1.21.0.exe

File size: 27.18 MB

To ensure the integrity of your download, please verify the checksum value.

MD5: 224e0a48b5ce97124bf3ac069b9e1b40

SHA1: b28fd72d4e7c22e390955d039e6ea8ca5c076df7

SHA-256: 9f00b39f2bfff678497d0ce3e481e81ede7555e549a006d091ea4d4c4f7f21e1

Download .EXE

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: 17.24 MB

To ensure the integrity of your download, please verify the checksum value.

MD5: 09c2fcee2131e9a6adee8c6691b93970

SHA1: 05aca12ba9afd55ce078df1297c4ebfe0f4d2852

SHA-256: f208ac978d7b6618c63178778b9961578a8e3c760be27bb2d840c1083dfa663a

Download .RCV

Fixes & Enhancements

- This release contains security updates as disclosed in the Dell Security Advisories DSA-2026-022, DSA-2026-069, DSA-2026-073, and DSA-2026-044. The DSA details are published on the Security Advisories, Notices, and Resources page, once they are publicly available. For more information about the release schedule, see Dell Client Drivers and Downloads Update Release Schedule.
- Fixed the issue where the Secure Boot cannot change from Audit Mode to Deployed Mode.

Compatible Systems

Inspiron 14 5435

Inspiron 16 5635

Vostro 16 5635

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 file.
5. Click Yes to open the BIOS update utility.
6. Click Update to initiate the update process. A progress bar is displayed.
7. Click Restart to restart the system once the progress bar reaches 100%.
The update process initiates at the Dell logo and an update initiation message is displayed with a progress bar. After the update finishes, the system automatically restarts.

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.

Dell Inspiron 14 5435/16 5635 and Vostro 16 5635 System BIOS

Download Files

Fixes & Enhancements

Important Information

Compatible Systems

Supported Operating Systems

Installation instructions

Applies to