This is not functional yet
This is an opensource watch framework. The same software can run in simulation (SDL) on linux, on pinetime and on the ds_d6 oled watch.
This is a demo, when you want to implement firmware updates over the air.
Zephyr has a procedure in place.
Look for MCUBOOT definitions in the source code
no requirements since it can run without board (simulation)
west build -p -b native-posix_64 oswatch-fota