Hi, I am trying to get this machine into bios recovery mode so I could downgrade bios. Currently on A06 but with unwanted service tag. I was thinking that the name of hdr file which i've been using was incorrect but it seems to be laptop not going into any sort of bios recovery mode. I've tried method with battery out, usb stick in, END key pressed and plug in but that only causes laptop to start. Could someone please tell me if this method worked for him?