PIX 501 PASSWORD RECOVERY

I AM TRYING TO RECOVER THE PASSWORD FOR MY PIX 501 FIREWALL. I HAVE FOLLOWED THE INSTRUCTIONS FROM THIS: http://www.petenetlive.com/Tech/Firewalls/Cisco/pixpasswordrecovery.htm

MY INSIDE ADDRESS IS 192.168.43.1 AND MY SERVER ADDRESS IS 192.168.42.19. AFTER FOLLOWING EVERY BIT OF INSTRUCTION, I STILL CANNOT PING THE PIX AND THE TFTP SERVER. WHERE DO I FAIL?