catalyst 3550

Xmodem will not work on a catalyst 3550
The command i'm using is
switch: copy xmodem:flash:c3550-i5q3l2-mz.121-11.EA1.bin
Unknown error.
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pendkpAuthor Commented:
for some reason I had to rename this file c3550-i5q3l2-mz.121-11.EA1.bin to switch.bin and tell xmodem to copy.  copy xmodem:flash:switch . all is well now.
Don JohnstonInstructorCommented:
Are you following this procedure:

If you are, please post the output from the session.
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