Upgrage ios for router with SCP

Hi Anyone can tell how to use Winscp briefly or send a link when we want to upgrade ios for router? The reason we want to use SCP instead of tftp is that there are several firewall around the router. Can we say SCP works like tftp server. After Winscp is installed in PC, we can use the PC as server of SCP to transfer ios. The difference is SCP needs ssh etc. but process is same as tftp or ftp, right? Thank you
eemoonAsked:
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atlas_shudderedSr. Network EngineerCommented:
Here's a pretty thorough walk through on SCP to a router.  Where the original author inputs for downloading the putty app and then pushing using cmd, you will use your winscp client.

http://www.ccierants.com/2011/06/great-way-to-copy-files-on-cisco.html

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atlas_shudderedSr. Network EngineerCommented:
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