We have a 6500 with the old Sup 1 / msfc1 . Do you absolutely need the bootloader file for this or will it boot ok without it ? We are putting newer code on it and there is not enough room in msfc bootflash for both the bootloader and the IOS. If we have to we can put the IOS on slot0: but would rather have it boot off the msfc bootflash: . Early on these boxes used to have problems trying to read the IOS out of slot0: . I don't know if this issue has been fixed at this point or not , I would hope so .