dfu-util can be used to communicate with DFU (device firmware upgrade) enabled devices.

One example is the Leaflabs Maple mini boot loader.

Be sure to have the latest version installed from at least 2020 if you intend to use the Longan Nano which may not work correctly otherwise.

git clone https://git.code.sf.net/p/dfu-util/dfu-util dfu-util
cd dfu-util
sh autogen.sh
./configure --prefix=/usr/local
make -j 4
make install