Enter “enable” at the prompt after a Cisco switch boots up. This gives you access to a privileged mode.
Command for TFTP ios upgrade; download Solarwind TFTP server
archive download-sw /overwrite /reload tftp://your-tftp-ip/your-switch-ios-firmware.tar
Command for Using Flash Drive
archive download-sw /overwrite /reload usbflash0:your-switch-ios-firmware.tar