Upgrading Catalyst 3750 with Express Setup

Backup existing config and image
# copy startup-config tftp
# copy flash tftp://
Upgrading 3750 with express setup image
# delete flash:c3750-ipbasek9-mz-122-55.SE1.bin
archive tar /xtract tftp:// flash:
(config)# boot system switch all flash:c3750-ipserviceslmk9-tar.122-55.SE9.bin
(config)#enable password level 15 cisco
(config)#line con 0
(config-line)#password cisco
Now you can access your switch using
L: cisco
P: cisco
Set your new password there

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