I have a GO920, which is almost identical to your GO930. I could never get navcore 9.160 to work properly. SE navcore 9.150 works fine however, as does SE navcore 9.205, so you may want to try one of them. I'm using a 870.3406 series map. If neither 9.150 nor 9.205 works, then it sounds like something is corrupted. I'd restart from the beginning, i.e., low-level format the internal memory, run Clear Flash, connect to TT Home and let it install the approved navcore (8.351), load a 870.3406 series map, run the activation software.
SE navcores are already patched, so don't worry when you get the "already patched" message when activating a map.