You need to trick TT Home into thinking you're still running the authorized navcore, which is for a GO 920 is 8.351. You need to create three text files in the TT root directory: ttgo.bif, ttgo.bak, and ttgo.ori. Ttgo.bif and ttgo.bak need to include "ApplicationVersionVersionNumber=8351" and "ApplicationVersion=9982". Ttgo.ori needs to include "ApplicationVersionVersionNumber=9205" and "ApplicationVersion=547817.1". The "readmenot" file that came with the patched NC has the details.