Strange characters like that are typically a symptom of a speed mismatch with the speed of the console port set to something that is different from the speed of the terminal emulator. I would suggest that you try the different speeds starting from 1200 and working your way up through the available speeds and see if one works. Be aware that with some emulators (especially Hyperterm) you need to stop and start the emulator every time that you change the speed.
If the last command was a confreg, I wonder if there might have been a typo mistake (or perhaps leaving off the 0x) which could have set a different speed.
And if the last digit of the value is a 0 then it instructs the router to boot to rommon rather than booting into IOS.
Thanks Rick. I managed to get the correct speed which is 4800. However I still cannot get out of the bad file magic number 0x0. Whenever I reboot the router, I have to go through all the ROMMON procedures again.
When you do show version, what does it say is the value of the config register? If the last digit is 0 that would explain why it is going into rommon. Change the config register so that the last digit is 2 and I believe that it will solve your issue with going into rommon.
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