Yes - - I have updated the Lighthouse.
To reiterate the Update Process:
Copy the image without renaming it onto a USB stick.
Plug it into a powered Lighthouse that shows all LED lit.
Middle light starts blinking - - left and right LEDs remain lit.
Middle and right hand LED go dark.
I pull the USB Stick out, and unit restores itself without recycling the power.
Magically, the Lighthouse reloads running 2.5.2
Is there anything specific to look for? Ken