samra wrote:I only know some tools for unpack, merge the gcd file from here: http://e-trex.info/archives/2008091737 and updater.exe.
This site is the originator of all the tools dealing with GUPDATE.GCD.
You can study in more detail here. http://www.gpspassion.com/forumsen/topi ... _ID=115804
First, you should learn how to recover if it's go wrong. Otherwise, your Oregon may become a dead brick.
The K/B is not include in .GTT like others. It need modification inside the firmware. To modify Corolado K/B is even harder, since it use Rock & Roller type K/B.
I'm waiting for Oregon 400t TWN version. It has more functions than the US one.