Yes you are screwing up, and your first problem is that you aren't reading the link I posed in the first reply to your question. Or if you did read it you aren't following the directions in it.
http://www.sminntech.com/z1flash.html
You need to read and follow that link. That will tell you how to check. You don't need to drive around or anything. You can do all this and know what you need or don't by following the instructions in that link.
But now that you left the parking brake on all the time, you will need to reset the unit. You never want the parking brake grounded all the time just by itself. Reset the Z1 with the recessed button to the right of Eject.
Then turn on your Z1 and let it boot up. And as I said in my previous post:
Make sure the parking brake sense wire is NOT GROUNDED (how ever that switch needs to be set). You can test that by letting it boot, go into:
MENU - SETTINGS - HARDWARE - CONNECTION STATUS
Look at the parking brake line and make sure it says "OFF". Lots of keys will be faded. Turn on and off the "headlights" or what ever you are using with that switch. Make sure the screen dims and that the ILLUMINATION line changes.
If that's the case, shut down the car.
Then GO TO THAT LINK:
http://www.sminntech.com/z1flash.html
Follow the directions.
If your unit is like the old ones, you never want the parking brake wire grounded. If it's like the new ones, you only want it grounded IF and only IF you ground the secret "other" wire.
Oh and by the way, the disclaimers will always come up. You can't get rid of the popup messages. The only one that will go away is the parking brake one.