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how to recover the password on CISCO routers and switches without loosing the current configuration

whats the Best way to recover my lost passwords without losing the current configurations on theses Cisco devices:  2811 router ,  4960g switch ,   877 router

thanks in advance.          
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1 Solution
gakhanAuthor Commented:
thanks i already Google it but i need to keep my current configuration as its
is this procedure will help ?"
well of course .. there is no lost in configuration saved in the nvram. if you've done some changes in running-connfig and didn't save them in startup-config you will lose all these changes restarting the device, which is pretty much the first step in every recovery procedure. if you don't like that I'm afraid you need to brute force your password. if it is not very secure password you'd might able to do that.

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