: Use a reliable TFTP server (like SolarWinds) or a formatted USB drive to transfer the .bin file to the flash0: directory. C1941 Router IOS Upgrade from 150-1.M3 to 157-3.M8(MD)
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Press Enter and follow the prompts to specify the IP address of the TFTP server, the filename of the IOS image file, and the destination filename. : Use a reliable TFTP server (like SolarWinds)