.scexe on SSH toESX5i

We are trying to update local disk firmware on a 5i host to recify a boot error message.  The server hardware is HP Proliant DL585.  There is a upgdate from HP called cp019264.scexe.  We are trying to run this using SSH.  We used WinSCP and copied the scexe to tmp on the host.  We logon as root, do a /cd and then ./cp019264.scexe.  We get a error message stating file not found.  DIR doesn't seem towork, but WINSCP shows the file is there.  This method was used with ESX 4.  Is there any other permissions we need to open up or a way to get this to run ?  Thanks.