Do a sh run, look for boot system command and unconfigure it. Change the boot variable to point to the new file using "boot system flash bootflash:" and reload. This should do it.
I believe you'll have to enter global configuration mode to change the config-register to 0x2102 because the Catalyst 4948 by default appear to have a confi-register 0x2101 (See Cisco Document ID 50421). I know I changed the bootvar and that was not sufficient as I was required to change the config-register for the new IOS to load.
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