I found the answer from another old thread.

MKIII Nav help needed - screen black after update - The Unofficial BMW M5 Messageboard (m5board.com)

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Purchased new 2007.2 mapo CDs from dealer today, and had them update my Nav software while there. Mine was original from its 10/2001 build date.

They updated to ver 17 but afterward the screen is black, and the power light is not lit on the Nav unit in the trunk. They worked on it until closing, but to no avail. The system has always worked fine, just the '01 maps were dated.

I'm a little stressed. What to do? Nav screen is black, radio/CD plays but turns off after a couple of minutes necessitating a power cycle of the radio to restore, but then they just turn off again. Apparently there is no power getting to the Nav unit in the trunk now and the head unit can't communicate with it as a result?
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Follow the guy - Carbon01. I had the same exact issue he described except his MKIII software version was at Version 16 or lower. Basically I need to downgrade the software version I inserted earlier. I will try Version 23 first. If not, I will find even lower version to downgrade.