This gist may help others who have a Netgear Stora that encounters the issue "Error message: at /var/www/admin/update.pm line 346"

Fix_Netgear_Stora.sh

#!/bin/bash

# This is the contents of the updated script:
NEW_SCRIPT=$(cat << EOF
package setup_update;
sub process {
    return 'success';
}
sub display {
    my $vars = shift @_;
    my $template = shift @_;
    $$vars{'name'} = $name;
    die 'Template error: ' . $template->error . "\n" unless $template->process('setup_update.html', $vars);
}
'???';
EOF
)

# Make a backup of the existing file just in case:
cp /var/www/admin/setup_update.pm /var/www/admin/setup_update.pm.bak

# Dump the new script into the old location. Note: this doesn't have to be compiled/turned into bytecode. 
# Plain-text perl scripts can be relablled .pm and used as modules.
echo "$NEW_SCRIPT" > /var/www/admin/setup_update.pm

Note to self: if I ever end up needing this again because I've reset my Stora, don't forget to disable uPnP (!) because it's on by default (!?!?!)