Look this k550 unlock problem!
 

K550I CID51 RED Net work was locked
i want unlock it use cruiser 07card 11.05 only 6 crdeit
starting: i first used "DB2020_GDFS_Reader_v1.02"backup this phone GDFS and into a files "k550.mdc":confused:
second: 1. Attach to phone ok!
2. unlock RSA OK
3. direct unlock
error"Could not initialize GDFS access."
and i flash "k550.mdc" the cruiser say"Error:Invalid stream header"
what can i do? plz help thanks
How to use this files"k550.mdc" and flash into this phone:confused::confused::confused:
NOW!!! I lost 5crdeit:(

Hi .. I think you should follow the procedure :

Unlocking procedure:

· Turn the phone on, then by pressing the >*<<*<* "secret" key sequence enter phone service menu. Go to the Service info submenu, then select the Software info item. Write down the first 2 or 3 lines describing the phone firmware version.

· Attach the phone normally, preferably via DCU-60 or DCU-65 cable.

· Go to the Security RSA tab and press the Unlock RSA button. One server credit will be deducted.

· Note: Now the first 768KB of main firmware is overwritten, so it has to be restored or reflashed by a suitable main FW flash file.

· Press the Restore firmware button. This operation restores the first 768KB damaged by the Unlock RSA operation provided the respective restoral file is found. If this operation fails, you need to reflash the whole main firmware by the same firmware version as written down in the first step.

· Now go to the Locks tab and press the Direct Unlock button.

· Turn the phone off (e.g. by pressing the <Ctrl-O> key combination).

http://forum.gsmhosting.com/vbb/showthread.php?t=416523
http://www.centralmobile.net/video/index.php?sort=name
video 100% ok unlock:D:D:D

now i lost 6 crdeit and the phone was locked!

It was Clear on the MANUAL Mate.
*Attack
*Unlock RSA
*Restore FW(You must download 1st the Restoral File at Support)
*Direct Unlock
*Turn Off

I actually missed up with my 1st Unlocking, phone was Unlock not Clear phonelock.