Uploading IOS to Cisco 4500 Device

1.    First, download the appropriate software for your Cisco device.
2.    Once you have the file downloaded, then copy the IOS to the correct folder where your TFTP will pull from.
3.    Now you are ready to upload the file to the bootflash (this is similar to other Cisco devices, but 4500Xs store it in the bootflash).
4.    Next, perform the following commands to perform the upload:
    a.    #copy tftp: bootflash:
    b.    Address or name of remote host? Input_Your_TFTP_IP
    c.    Destination filename? YouCanChangeOrLeaveDefault
    d.    Now you await for the upload to finish.
5.    After your upload has finished, you can now verify the upload has been completed and your file is showing:
    a.    #dir
   
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_24829.html#96288

Backup Cisco IOS on 4500X

1.    First, log into the Cisco device you wish to upgrade.
2.    Perform the following command to verify which IOS version you are currently running:
    a.    #show version
    b.    Scroll up and look for system image file, will say something like “bootflash:cat4500….” or something like this talking about the booting on flash.
3.    Depending on the version or type of switch, you can do either of the following commands to check the directory to verify how much space and what images are loaded on the Cisco system.
    a.    #dir
    b.    #dir flash:/
4.    So once you find the version IOS you are running, and the name of the config file in the directory, you can copy the original IOS to your TFTP server/client by typing in the following, (again, this is to back up the currently running IOS in case any issues arise with the new IOS. If there are any issues, you can easily re-upload this file back into the Cisco system and recover).
    a.    #copy flash tftp
    b.    #Source filename[]?YourCurrentRunningIOS
    c.    #Address or name of remote host[]?YourIPAddressOfSystemToSendIOS
    d.    Then just wait for the copy to transfer to the backup destination.
    e.    You can check the file location you have your TFTP set to download to in order to verify the IOS has been downloaded.

Reference:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_24829.html#96288