The upgrade is like any other Cisco Switch or Router upgrade - you need a TFTP server that has the new IOS image available on it. Then you simply 'copy' the image via TFTP to the flash of the 2948G-L3. If there isn't enough space available you may have to delete old images that are there; be careful here though as you may leave the switch without a bootable image and you will have to use XModem to recover it.
Command would be something like:
copy tftp:10.1.1.1/new-ios-image.bin flash:
If you just type 'copy tftp flash' the switch will prompt you for the TFTP Server's IP address and the IOS filename.
Once you have copied the image then you need to change the configuration to boot from the new image:
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