If you have an original cable ??? whit your c55 use this
Open your cable whit a knife or something like this:
http://www.gsm-multifund.com/Anleitu...mt50/bild1.jpg
Then connect 3 1.5 volt battaries whit eachother and wires at the end like this
http://www.gsm-multifund.com/Anleitu...mt50/bild2.jpg
Then connect the Plus (+) whit pin 1 (you can slide the wire in at the back) and - pole in the shaft from pin 2. Make sure you do this job while your cable is unplugged. (for safety)
http://www.gsm-multifund.com/Anleitu...mt50/bild3.jpg
ok now you can use this program to unlock.
http://www.gsm-multifund.com/Downloa...0-java-new.zip
(to test if your battaries are connected you can look at your phone and when you see that your battary is charging then it is ok.)
Good luck
4 questions ... please mail/post sometin
grtz DeNMaN