Please find the up-to-date instructions on manually flashing Lighthouses here:
Excellent Instruction set 
Here’s another Wiki Page you might want to consider updating https://wiki.outernet.is/wiki/Receiver_firmware_images
Maybe just refer back to https://archive.outernet.is/images/ORxPi/ and https://archive.outernet.is/images/Lighthouse/ and say something in the text about finding the latest version at the bottom of the list.
This way you don’t have to change the page every time you do an update to the software. Ken
Fixed.