YOU GUYS ARE THE BEST!!!!

Starting the pre-boot sequence with the power switch in lock mode did the trick. I was able to flash to the original firmware (moved the lock mode switch to normal position during flashing) and the Garmin Web Updater identified the device afterwards.

After getting back control, i ran a scan of my Nuvi 780 disk. 25% of the disk is damaged and is most likely what caused the infinite reboot in the first place due to file corruption.

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What are my pragmatic options from here. Use an SD Card to store all maps and that way i can extend the use of this device? What would it take to repair the damaged disk?

Thank you so much again for the timely help.