To prevent TT Home from downloading & installing Navcore 9.400
Open the ttgo.bif file with Notepad.
Replace lines 9 & 10 with these:
ApplicationVersionVersionNumber=9400
ApplicationVersion=851694.1
Save this change by clicking "File" in the upper left corner of windows explorer, then "Save as" ttgo.bak. At this point, there is only a ttgo.bak file in the root, no ttgo.bif.
Disconnect & reboot. Now you will have a ttgo.bak, a ttgo.bif & a ttgo.ori file in the root & no TT Home upgrade to Navcore 9.400.
It is now the official Navcore for most devices, but if you dont like it you don't have to install.
It won't affect your subsciptions unless you say no at the start for the information sharing, same for MS and Quick fix.