Hi to answer your question ... The answer is no you would have to downgrade to go back to the 80mt..

However the 9o mt work better.... if you use XM radio you get your icons back that did not work with the 80 mt and your unit boots much fast ... Plus the map up dates its a win win..

SWDW

How do you back date it to the original disc. My disc is having issues so it won't let me use the original DVD map disc it came with.

MORPHOUS WROTE:

Downgrade Instructions for bad map data

Fix for an upgrade gone wrong:

If you find yourself with a non working unit or corrupted map data after the upgrade do not despair, there is still hope to "downgrade" your unit. First go to system settings and change the language (doesn't matter if it's to french or Spanish) Let the unit "upgrade" your unit again and make sure it goes well and finishes. then change the language back to English, but hit the eject button before the unit has a chance to start the upgrade. You will see "insert the appropriate disc" message. Take your old working disc (CNDV-80MT) for example and place it in the unit. IT will then "Upgrade" to the older version. You should now have your old version in English.

I hope this information makes things a bit clearer for people and condenses things for anyone looking. Thanks to everyone for helping out and seeding. That's what makes this community so great!!

I'm still running the original disks that came with my unit, and I'm curious, does the -90MT have the same firmware update on it the -80MT does? I want to get the latest disks, but not if they do not have the firmware update as well.

Just trying to figure out if I need both sets of disks.

im curious about the 90mt as well. im still using the stock 2007 disks that came with my d3 and i downloaded the 90mt yesterday and was going to try them out today but i seen this post so im not sure if i want to do it now if it will mess things up. i didnt even know these had any kind of firmware on them. but im still very new to them also

Ok gents I AM BACK rested and ready :D

If you need a set on disks PM me and i will ship same day .........

SWDW

SWDW, do these have the firmware update that the MT80 has?

There are firmware updates on the 90 MT

The xm icons now work as opposed to the 80 mts also the unit boots and re boots faster.

This is my opinion only the units works a little faster and smoother with the 90MT..

plus the map updated that you get ..

Win win to me

The 90MTS are better

Just want to make sure im not missing anything skipping directly over the 80MTs.

You are not missing anything