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PIX 500 Series Password Recovery Fails

I have a PIX 500 series firewall for which I need to recover the password. I have followed the instructions contained in Cisco Document ID: 8529 - "Password Recovery Procedure for the PIX", but cannot regain control of the device.

When the proceure asks if I want to remove the password, I respond Y; when it asks if I want to remove the configure, I respond N.  The procedure then proceeds as documented,  reboots the PIX, and places me back into the monitor.  I type in the command "enable" and am asked supply a password.  According to the documentation, there should be no password, so I respond by hitting "Enter", only to receive a "Login Failed" message.  The PIX was confirmed to be running software version 7.1(2).  The password recovery file used was "np70.bin.  Despite much searching on the net, I could find an "np71" file.

I've tried using both "" and "cisco" as  passwords, tried logging in as "admin" or as "cisco" but am repeatedly rejected.
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This procedure is also suppose to change the telnet password back to the default.  Can you telnet by using the default telnet password cisco?  
JDL_TechAuthor Commented:
I performed an SSH session with the firewall using "admin", "Administrator", and "cisco" as users.  I'm still denied access while using the default "cisco" password.
JDL_TechAuthor Commented:
I found my error.  With OS  7.1(2) one first must change the "enable" password, then authorize the system to make the change.  I failed to do the latter.

I now have regained control of the firewall.
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