Plus there is also this:
Mio Transfer Hack for C220, C250 and unlock for Mio C250 [C220?]:
For a lot of actions described on this site you might need Mio Transfer Hack. I think this program is an essential asset for altering / adding / deleting and copying files on your device.
Install Mio Transfer on your PC. It is on your DVD. Then copy mio transfer hack.exe into the install directory. Now you are all set.
Turn your device on before connecting to your pc through the usb cable.
Download Mio Unlock and Transfer Hack:
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PW: navitotal.com [if necessary]
EDIT: You might want to read this thread regarding the Mio C250
http://www.navitotal.com/showthread.php?10385-Unlock-Mio-C250