Well, I have the same problem still. It sometimes displays D and _ sign and blinks. I`m always going to neutral before switch off the ignition and sometimes the "underlined D" problem appears WHEN I`m trying to switch from D to neutral. I press "N" button, bike "thinks" a little and then
D with blinks appears. You can use the engine kill switch or just turn ignition off and on and in most cases it works. But sometimes the
D stays after egnition on/off or no
D just red oil light stays and
- blinks. In this case turn the engine off with kill switch, then hold the engine start button and while holding it turn kill switch on. The green "N" turn on only for about half of a second but this is enough for bike to start. Then you can go D/S etc like always.
I`m worrying that by some reason the N/D clutch, solenoid valve etc may be stuck or worn.
I also think that
this,
this,
this,
this,
and this threads have ALL the similar roots with N/D.
Or it may be the battery. At this year I have really poor chinese one and this started when I`ve bought it. But I`m not sure why solenoid lock-up uses only battery power if ignition is on and engine is running.
Also, regarding this problem, if the bike is not heated properly and you`ll try re-initialize HFT with a simple tool, you will notice that the bike skips part 4 of initialization procedure. Probably the same issue here, because battery don`t have enough power to make the system perform all checks. Even with engine running.