Alright, I'll break it down a bit further.
Download M-prog. I've attached it here.
Unzip/install the program. Open it up, and in the TOOLS bar, select READ AND PARSE.
Save that number. From here you can either: Edit the galletto executable with a hex editor (attached in the first post), browsing to the offset listed above and enter YOUR serial number into the program, or if hex editing isn't your thing, you can program your cable with the bundled galletto serial number. Those steps are listed below.
Select the FILE menu, and NEW.
Select your device type. FT232R.
Once you do this, check the box titled "select serial number". Enter the serial number shown above.
Finally, hit SAVE TEMPLATE AS (it's the small disc ICON in the menu), and specify the template name. Once it's been saved you can select PROGRAM.
Your cable now has the serial number of all galletto bundled cables, and will work when plugged in. Changing the serial number in your cable will NOT invalidate your nefmoto premium license, HOWEVER other licensing systems may be affected. Be sure to save your original cable details PRIOR to reflashing your cable!!!