How do you flash with updater.exe?
Updater.exe see your device in pre boot, so again create procedure like before when you flash cure but this time flash with original.

Try press on black screen in position where you have previous button for mass storage, if i remember correct screen will turn On if you disconect kenwood from power and after 5 min add power back.

p.s.
I still don't know what you talking about.
First you say that you delete mass storage and then you have all folder in kenwood, then you say that you don't have garmindevice.xml but on picture is visible.