Greg,
Welcoe to the forum. Sorry to hear you are having issues. Just so we can log your problem for future troubleshooting, please let me know the specific steps you took to perform the update.
What unit do you have? Did you restore defaults before and after? Did you insert the SD card before or after you powered the unit on? What version software were you upgrading from?
The best way to get it back working properly is going to be to backdate the software and then reinstall the new update. Make sure you have a fresh copy of the software update on your SD card.
With no SD card in the unit, power it on.
Restore the defaults.
Insert the SD card with the update on it.
Follow the prompts. YES you want install new update and NO you dont want to abort.
Screen should flash and update should take about 15-20 seconds.
The unit will reboot
Remove the SD card
Restore the defaults again.
Let me know if you have any problems.
Good Luck,
Robert