wrong system software for my router (cisco 3620)

Hello every one!!

I have cisco 3620 router. I made a mistake when I upgrade the software. my previous image was c3620-i-mz.120-4.T. I erased it and copy the image c3640-i-mz.122-19a.bin from TFTP server. After I finished, I reloaded it. But when it boots, it says "wrong system software for this hardware"  continously so that it can't start. How can I correct my problem please? or how can I copy the previouse image to my router from TFTP server? Actually I have taken back up the flash image before I upgraded.
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JFrederick29Connect With a Mentor Commented:
Within the first 60 seconds of the router booting, press CTRL-BREAK in Hyperterminal to enter rommon mode.

Once in rommon, you need to set the following variables:

IP_ADDRESS—IP address for the router you are using.
IP_SUBNET_MASK—Subnet mask for the router you are using.
DEFAULT_GATEWAY—Default gateway for the router you are using (not required if the TFTP server is in the same subnet as the router).
TFTP_SERVER—IP address of the server from which you want to download the image file.
TFTP_FILE—Name of the file that you want to download.

For example:

rommon 1> IP_ADDRESS=
rommon 2> IP_SUBNET_MASK=
rommon 4> TFTP_SERVER=
rommon 5> TFTP_FILE=c3620-i-mz.120-4.T

Once you set the above variables, you can type the tftpdnld command and press "y" to proceed:

rommon 6>tftpdnld
Do you wish to continue? y/n: y

Make sure you have your TFTP server running and the previous image in the root of the TFTP server's folder.


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