I am tryig to rebuild an IDS 75 because I am unable to login. I have the Juniper ISO and attached it via CDROM (also tried USB key) and booted the IDS off of it. It begins the install process, but then fails saying that it is unable to load the kickstart file from the cdrom. See attached pic.
Do you have an original usb stick recovery media - that's the same error you'll get if you try and clone the recovery media. I don't know what it takes to make a working backup copy- but you can order a spare recovery usb stick from Juniper.