Unlike other Cisco routers, these series routers do not have a boot image in ROM or bootflash.
To resolve this issue, perform these steps:
Issue the dir flash: command, as shown in this example:
rommon 1 >dir flash:
program load complete, entry point: 0x80008000, size: 0xb2a0
Directory of flash:
2 6821196 -rw- c3725-i-mz.122-8.T5.bin
1668 15373100 -rw- c3725-is-mz.122-11.T6.bin
rommon 2 >
For example, to boot an image named c3725-ds-mz.122-13.T.bin from a TFTP server with the address of 10.1.1.2, the ROMmon command would be as shown:
boot c3725-ds-mz.122-13.T.bin 10.1.1.2
Note: The tftpdnld command is only available with the Cisco 1700 and 2600 series.
For step-by-step procedures, refer to these documents:
Once a bootable image is in Flash, booting from a TFTP server is possible.
router(config)#boot system tftp c3725-ds-mz.122-13.T.bin 10.1.1.2
Save this configuration before reloading.
There are some good resources for the Cisco 1700 here including password recovery documentation http://www.ciscobuy.com/cisco-routers/cisco-1700