(Find a TFTP server software (such as TFTPServer of CISCO or 3Cserver of 3COM, etc. When upgrading large IOS image files, it is recommended to use 3Cserver), install it on a computer, and copy the upgraded IOS image file to In the relevant directory (eg: D:), and the office TFTP server software, set the Root directory through the menu as the location directory of the imitation IOS image file (such as D)