You can find the most recent version at the mw-wf-cli GitLab project page. This repository will be kept as is, and will not be updated anymore.
Command line client for wflash WiFi bootloader
Currently only builing under GNU/Linux is supported. But feel free to adapt the sources to other platforms. And do not forget to send the pull request when you do ;-). To build the program just install a working compiler and use the provided makefile:
make
This should build the wflash program and leave it sitting in the current directory.
wflash has built in help. Just launch it and it will tell you the supported options. Of course you will also need a wflash bootloader programmed to a MegaWiFi cartridge, inserted and running on a Genesis/Megadrive consonle. I will detail a bit more this section when I get some more time ¬_¬
This program has been written by doragasu. Contributions are welcome. Please don't hesitate sending a pull request.