So I tried the SD method with the below file structure. Seems to work fine. I didn't use the ASR files mostly because my SD wasn't big enough, however as I read it they aren't used anymore in the 9990hd. The JCV is the split screen.



H:\GARMIN

| GMAP3D.IMG
| GMAPSUPP.IMG
+---\JCV
| D3191150A.JCV

Thanks to SamSpade13 for his file structure work. (maybe not the first but its the one I used) I unlocked the 2 .img files just for kicks using gimgunlock. I don't know if it was required but I did it.

After I installed it, both the OEM and the SD map was listed as map options. I just unchecked the OEM incase there was some conflict. Anyone having trouble with the SD card not loading, update your firmware. That seems to fix those issues for most people. Now I just need higher cap SD "that works" and then I will see if I can add any other options to it. I thought my junction view was selectable between fullscreen and split. i only uploaded the split. i would like to try the fullscreen also just because if i can why not.