what normally happens is that Dell revises the bios packages so that they only run on currently supported OS's. ESX 3.5 isnt supported by the openmanage teams, so you will have to jump a few hoops to get this going. What  you will need to do is to create a bootable cd using the iso below, then flash the bios (probably from a usb key). linux.dell.com/.../omsa-65-live
Hello All, Our Dell PE 2950 is running WMWare Esx 3.5 (Releasebuild-110268) and i was able to update through console from original bios 2.0.1 to 2.3.1. After that I found that it's not the latest version, the latest is 2.7.0 but when i tried to repeat all steps but for ver. 2.7.0 i've recieved this error: [root[NAME] root]# ./PE2950_BIOS_LX_2.7.0.BINCollecting inventory....This operating system is not supported. BIOSThis operating system is not supported. This operating system is not supported. Can anyone help how to resolve this?
Unable to update BIOS at PE 2950 to 2.7.0