I recently got my hands on a new Navi-DVD but the second disc for east coast and I live in northern CaliforNIA, and I was tempted to put it in my D1 and so I did. After it updated my system, it will not accept the 2005 Navi DVD Disk 1 anymore. It keeps giving me the " Please Enter Appropriate Disk" message when I put my old navi-dvd in. Anyway that I can downgrade to the old 2005 version so I can use my old navi dvd instead of paying for a new navi-dvd disk 1?

2005 GMC Yukon SL

Pioneer AVIC D1

Almanni 700W

Dual Electronics 2x 12"

Next time come here and ask before you go and mess it all up. Search the forums. The instructions to downgrade have been posted before.

Ok. Thanks.

I know. It was just one of those stupid things that you suddenly decide to do. But still I have a questions for you; if I were to purchase a copy of the newer version of the navi-disk, would that make the routes and data work fine???

I have been searching for the downgrade instructions but can not find them. I know there were here because I used them to downgrade my D1.

I found one thread where I responded that the instructions worked, but the instructions were not there ... maybe the downgrade instructions have been deleted.

bump....i'm having the same issue with searching for downgrade instruction. And for shits and giggles i'll throw on the flame-proof suit for the douche bags who feel it necessary to flame rather than post a link.

here it is fellas....damn the people that dont want to help but rather be a pain in da azz....

did this a few times before it worked...try it till it works...it will

The Buttons:

OK = JOYPAD INWARD

BACK = JOYPAD TO THE LEFT (previous menu)

BACK = BAND BUTTON (info button)

Step #1: Accessing the Service Menu (first remove any discs)

Hold Reset & Eject

Release Reset but HOLD nav disc Eject button

The screen with go back in and out, then will say "Please press the reset button"...DONT!

Then with the joystick, press the following:

UP,RIGHT,UP,RIGHT,DOWN,RIGHT,DOWN,RIGHT…THEN OK(press right joystick inwards)

Password screen will come on breifly.

STEP #2: Flashing the Navigation Software

Test mode screen appears - CLICK JOYSTICK TO RIGHT ONCE

Scroll down to #6 - PROGRAM FORCED WRITE (press OK)

INSERT THE NAVIGATION DVD (whichever version you want)

Select #1 SYSTEM PROGRAM (press OK)

Select #2 DVD/CD ROM (press OK)

Select LANGUAGE… (ENGLISH)

PRESS map BUTTON

SHOULD SEE SYSTEM PROGRAM GOING UP IN %

STEP #3: Flashing the Navigation Software Part II

When finished programming in above step, Press (BACK)

Select #6 - PROGRAM FORCED WRITE AGAIN (OK)

Select #3 - APPLICATION PROGRAM (OK)

Select #2 - DVD/CD ROM (OK)

Select English - THEN PRESS map BUTTON (**Select English/UK if you are installing the X1 software)

SHOULD SEE SYSTEM GOING UP IN %

WHEN FINISHED PRESS (BACK)

Go to TEST MODE PAGE 1

SELECT #6 - CLEAR BACK UP MEMORY (OK)

Should say FINISHED and then asks for reset button to be pressed. When prompted, press RESET.

thanks a lot king.titan. i have been waiting for someone to thoroughly help some folks here including me. I will try it tomorrow and will let yoll know if this really works alrite?

thanks a lot king.titan. i have been waiting for someone to thoroughly help some folks here including me. I will try it tomorrow and will let yoll know if this really works alrite?

well it does work i did it a few times and it does work. good luck fellas....forget the do littles on this site that dont want to help with a easy answer!!!1