I stop the update of firmware in archos 7c

When i update the firmware. I stop it. Well the screen was black and i can't open the phone. Please a solution. And thanks.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0