If the switch is not booting up after the xmodem, I would suggest downloading the code from CCO and trying the xmodem again.. the file possibly got corrupt during the transfer the first time. Here is a helpful url on recovering from corrupted software:
switch#copy run start (skip if you don't want to keep the running config)
switch#sh flash (IMPORTANT: make sure the new ios.bin image and config files are present BEFORE reloading the switch!)
I would download the correct *.tar again, the one you're trying to use could be corrupt. Maybe you could try doing this upgrade from a different PC?
NOTE: This can only be performed when the switch is up and running IOS! Formatting will get rid of vlan.dat file too. I wouldn't recommend using these steps in a production environment, but only as a quick way to upgrade and/or wipe clean, a switch back to its factory defaults!
If you still are having problems, paste in a sh ver and sh flash from your switch, for me to look at. Thanks...
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