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I have the backup file of the Sonicwall TZ210 but lost the admin password.

The backup file is .exp, is there a way to decode it using windows pc?

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This is not a complete solution, but a start. With Linux, you can use this to decode the dump:

base64 -d your-backup.exp | sed 's/&/\n/g'

Or use this Perl Script:

#!/usr/bin/perl
use strict;
use MIME::Base64;

local($/) = undef; # slurp

my $decoded = decode_base64(<STDIN>);
$decoded =~ s/&/\n/gms;
print $decoded;

You will find the password line and might be able to brute-force it with john the ripper (http://www.openwall.com/john/). There is no easier way here.

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