Easy way to erase a router's config & reload an IOS? Dont know passwords..

I've been given a couple of 3640 routers, one of them had no config and I was able to work with it. The other 3640 had some config on there and heres what I've done so far.
*Change config regsiter and booted up to access the startup config.
*Copied all data
*Whenever I do the command "copy start run" I get some weird memory dump issues (but that is besides the point) and I cant change any data or do any commands.
I want to erase the router and put a new IOS on it. I dont know any passwords how do I do this easily? Im guessing a simple config register change from within ROMON mode????
Anyone have a how to: for me????

If you do the parts of password recovery that deal with accessing the router, setting the config register to 0x2142, and booting the router you will have wiped the config and kept the IOS. You do not need to do the other parts of password recovery. Once you have wiped the config and booted the router be sure to set the config register back to its normal value (probably 0x2102).
In looking at the error that you describe, this part (%AAAA-3-INVSTATE) seems to indicate that the error is generated in AAA. We do not know what is in the existing config, but I believe that it is something in the existing config that is causing your problem and not some inherent problem in the router.
Try just setting the config register to 0x2142 and booting the router and let us know if that worked.
HTH
Rick

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