i am out of idea even i search many info from google search. problem is like this.
i newly upgraded my cisco 877w both memory. when using telnet to connect to router, i don't know what is exact ip address, subnet mask and more for the router. i install tftp server which using very old edtion of cisco tftp server & & the tftp server root directory i browse the directory where the cisco IOS file locate & which display the ip address of 192.168.1.3.
even i type help, i don't know which command is starting first. i search other forum, which starting "router> enable". i even can't get that.
now i want install the cisco IOS, what should i do.
You are already in the configure mode. So, you do not need to enter
"configure terminal" again.
Asuming you have a valid IOS image on flash yet. Can you try this, please?
I see the problem now.
Your 877w does not have a valid IOS image to boot from, thus your router does not accept any command because it have no "operating system".
Your router enters in ROMmon mode and you are unable to issue any IOS command. You have to upload a valid IOS image for your router trough the xmodem method described here:
This is not a specific guideline for 877w but may be you can use this method to fix your problem.