Hi Diego,
Just been through this in the last week.
If youv'e got a BDM tool don't fiddle around with embedded bootloaders, upgrade your CW to Special Edition. I had to request the licence file by email as I got no registration code in my kit. The kit comes with 3.1 on CD and the available code (SMAC4.1a etc) is designed for 3.1. They sent me a licence file that looked like it was for V5.0 but it worked. Indeed when I checked with the licence file in my downloaded version 5.0SE it is the same.
BTW, you can use it with CW5.0 but you have to wade through all the warnings and errors etc, using 3.1 they just work straight up.
BR Peg