From the link above, some of the bash history from @adra12:
// Open the following file with VIM text editor for editing
vi driver-baikalu.c
// View sgminer CLI
sudo screen -r
// List content
ls
// List content
ls
// Delete this folder
rm -rf sgminer/
That means that sgminer was compiled on the machine, and they deleted the folder with the source code. Still there are no traces of the source code of the firmware. And both of them are needed.