Enter "tftp -i 192.168.1.1 put dd-wrt.v24-micro_generic.bin" on your local Windows console and press enter. (If you're using Windows Vista or Windows 7, you need to first enable the tftp client)
(for linux, tftp 192.168.1.1; mode octet;put dd-wrt.v24-micro_generic.bin or tftp -v -m octet 192.168.1.1 -c put dd-wrt.v24-micro_generic.bin).
(for linux, tftp 192.168.1.1; mode octet;put dd-wrt.v24-micro_generic.bin or tftp -v -m octet 192.168.1.1 -c put dd-wrt.v24-micro_generic.bin).