How to check firmware:

Prerequisites for Linux (Debian/Ubuntu/Raspbian):

sudo apt-get install build-essential cmake libusb-1.0-0-dev pkg-config

Build host software on Linux:

wget https://github.com/airspy/airspyone_host/archive/master.zip

unzip master.zip

cd airspyone_host-master

mkdir build

cd build

cmake ../ -DINSTALL_UDEV_RULES=ON

make

sudo make install

sudo ldconfig

Then run:

airspy_info

Clean CMake temporary files/dirs:

cd airspyone_host-master/build

rm -rf *