In your PM's to me you didn't mention the reset and the ground "switch".
What's happening is for the first 50 miles or so of the Z1's life, just grounding the parking brake is enough for it to unlock stuff moving or not. But eventually it will start realizing that you are moving and lock you back out again.
I would bet money that flashing your lights is not doing anything, but it's cause you reset the unit.
I'll bet if you reset the unit, didn't flash your lights you would get the same thing.
But unless you ground the secret wire in connector 2, it will eventually pop up a parking brake warning message. You should ground that wire in connector 2 like I tell you to for the 07/06 bypass and then flip your ground switch on all the time and you will be good to go.
As much as I would like to sell you something and make a few bucks, my circuit (or anyone else's for that matter) will not work for a July 06 and newer Z1.