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Change Configuration Registry on Older Cisco Routers

I found an ancient 2500 series router today and had to go through a password recovery. The rommon version was earlier than any I had seen before. The help functionality was very lean. Here is how to set the confreg for these older models.


If the rommon help screen (Type H to see it.) states that you need to type O to look at the configuration registry, you set it like this:

o/r 0x2142

I manually power cycled after this and had success. When you get things working again, I suggest backing away very slowly and cautiously.

Quinn McHenry
Quinn McHenry
Quinn was one of the original co-founders of Tech-Recipes. He is currently crafting iOS applications as a senior developer at Small Planet Digital in Brooklyn, New York.
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