I found this solution from another thread. Good luck to those who had the same issue as mine. It apperead my MK3 still has some value once I fix it. Hahaha.... I still plan to buy an aftermarket Android Head unit. I found one that is not Danavin Android. I can not buy it till the manufacturer's Chinese New Year vacation period - around January 30.

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MKIII NAV blank screen fix v23 - The Unofficial BMW M5 Messageboard (m5board.com)

MKIII NAV blank screen fix v23

If you own a MKIII and have these symptoms this fix (might ) correct it. fficeffice" />


Symptoms:

Blank Screen with white lines top and bottom.
Radio and CD changer works along with buttons to operate but music shuts off after 2-5 minutes. Can be powered on and same thing happens again music shuts off.
CD is stuck in NAV.
Reasons Why this happened:
You tried to upgrade to v26 with a hack splash screen or other non OEM files.
You tried to upgrade and the cd was corrupted and stopped mid way.
You replaced your battery and this happened.
You changed your radio fuse and this happened.

Tools that you will need:
You need to download v23 at this site. http://www.xoutpost.com/articles/all...ng-system.html
You need to download this burning software ALCOHOL 120%, trial version here Alcohol 120%
Download Winrar 3.51 so you can decompress files here WinRAR archiver, a powerful tool to process RAR and ZIP files


FIX:
Unzip and extract all files to a destination you choose with WINRAR
Open Alcohol 120% and select burn from image, hit browse and select the folder you extracted to. Then select the file with the extension CCD and hit next. You will notice that 3 files populate with about 250mb. Hit next to continue.
Burn at 4x speed on a name brand disc, Memorex and better.
Explore cd to verify that it is readable, do this a few times and make sure it recognizes quickly by your pc and test open and folders or sub folders.
Go to your Beast and turn the key to the 2nd dial, make sure your stereo is off, remove key and close door.
Open trunk, insert CD then CLOSE TRUNK.
Go into the car and turn key to 2nd dial, Stereo should still be off.
Leaving key as is, exit car and close door.
You can wait but it is best to leave car behind for about 30-45mins and come back.
If this works your system will read update complete press okay to reboot.
I am free for lunch.
Your MKIII should have the newest version 3-1/63. This was a nighmare but just wanted to make sure members who encountered this has a step by step approach. Your NAV is not DEAD yet have faith and be patient.

DREW