1. Download the required HPE firmware.
Using a web browser got to the HPE website, and download the required firmware package for VMware vSphere Hypervisor ESXi
2. Extract the ZIP archive to your computer.
Using Z-Zip extract the contents of the archive ZIP file.
3. Transfer all the files to the ESXi host server.
Using WinSCP transfer all the files to the ESXi server Please see this video if you need to enable SSH -
HOW TO: Enable SSH Remote Access on a VMware vSphere Hypervisor 7.0 (ESXi 7.0).
4. Login to the ESXi server using SSH
Use PuTTY to connect to the ESXi server.
5. Set permissions on the firmware file
Using chmod, set permissions to execute the file (+x).
6. Execute the firmware file.
Execute the firmware file .vmexe64.
7. Accept the conditions.
Select Y(es) to update the firmware.