EC control a lot of things, e.g. enable/disable devices, notify power states & more. So, something must goes wrong with the EC which lead to BIOS flash failure. When you update the BIOS, does it stopped half way & your system become unresponsive? This is not normal. I have been told by Dell engineer that it should successful & if it is not, the hardware might be faulty. There is only one version of BIOS installed in a computer. It is either Award, Phoenix, Insyde or else. BIOS is not like operating system installed in hard disk (windows, linux) which you can freely format & reinstalled whenever you want. You can't mistakenly update the BIOS with wrong version. Even if you forced it, it only brick the computer. EDIT: BTW, when it come to BIOS, we should apply "If it ain't broken, don't fix it" policy.