Question : Problem: Cisco 3620 Router no booting.

I have a Cisco 3620 router. I loaded the wrong IOS on it, and now it only works in ROMMON. When it tries to load the image it then reports that it is the wrong hardware for the hardware. I can up load the old IOS to the router but it does not save it to flash, it holds it in memory NVRAM. I would like to know how to delete the incorrect IOS and how could I tell the router to boot the image in NVRAM and forget about the one in FLASH?

Answer : Problem: Cisco 3620 Router no booting.

Copy the image into ram like you did before. From the rommon prompt type "load (image name)" and it should load the image for you. Once you have it loaded, using a tftp server, do "copy tftp flash" and you will be prompted to erase the flash before copying the image into the flash. Give it the image name you are load and follow the prompts. At this point you will say yes and yes to the next question asking if your sure you want to erase flash, and it should complete for you. Before you reload the router do "config terminal" then "config-register 0x2102" and hit enter. Then do "copy run start". At this point you should be able to reload the router and have it come up.