Had the same problem.  Solution: You need to get a working flash with the IOS image and place it into the slot that has the problem insert at rammon> confreg 0x2142rammon2> reset Either format the flash in FAT16 or get a Flash already formatted in Fl...

 Don't panic, don't think a RMA is necessary.   I had the same problem! Solved!Try booting from the USB using an image already installed on the USB: For example :First after inserting the USB flash,  do a dir at the prompt.Then go ahead and boot from...