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How to upgrade Cisco IOS

1. Copy the new IOS-Image in the flash memory

Switch#copy usbflash0:c2960x-universalk9-mz.150-2.EX4.bin flash:

Destination filename [c2960x-universalk9-mz.150-2.EX4.bin]?
Copy in progress...CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

18228096 bytes copied in 278.698 secs (65404 bytes/sec)

2. Erase the old IOS-Image and the old configuration from the flash memory

Switch#delete /recursive /force flash:/c2960x-universalk9-mz.150-2.EX3
Switch#delete flash:/vlan.dat
Delete flash:/vlan.dat? [confirm]

Switch#

4. Erase the running and startup config

Switch#write erase
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete

3. Set the new default IOS-Image to boot system variable

I know that boot system take the IOS were are avaliable in the flash memory for booting the system by default. To be sure that the correct IOS-Image version is booting, I like to check and set this configuration with the boot system command.

Switch#show boot
BOOT path-list : flash:/c2960x-universalk9-mz.150-2.EX3/c2960x-universalk9-mz.150-2.EX3.bin
Config file : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break : yes
Manual Boot : no
HELPER path-list :
Auto upgrade : yes
Auto upgrade path :
NVRAM/Config file
buffer size: 524288
Timeout for Config
Download: 0 seconds
Config Download
via DHCP: disabled (next boot: disabled)
Switch(config)#boot system flash:c2960x-universalk9-mz.150-2.EX4.bin
Switch#
Switch#show boot 
BOOT path-list : flash:c2960x-universalk9-mz.150-2.EX4.bin
Config file : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break : yes
Manual Boot : no
HELPER path-list :
Auto upgrade : yes
Auto upgrade path :
NVRAM/Config file
buffer size: 524288
Timeout for Config
Download: 0 seconds
Config Download
via DHCP: disabled (next boot: disabled)

4. Save the new config

Switch#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
Switch#

5. Reboot

Switch#reload
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