For X51v this has been a real problem for me. You may want to read the follwoing by Menneisyys
http://www.aximsite.com/boards/showthread.php?t=138412
On the x30 High I had lots of luck with SK Tools but it does not work at all with the X51v from my experience. Also the password protection appears to present problems with some of the recommended software. The following is a little informal test I did with my fully loaded machine and the results. The best was with Sprite but even that was mixed:
http://www.aximsite.com/boards/showt...51#post1263151
Good luck. I am still looking myself. So if you find a real workable solution with password protection I really want to know.