Plug the flash disk into USB and with the command dmesg look for the device where it has been mapped on. Suppose the device is sda1.
Now, mount the flash disk’s filesystem on the directory /mpoint with the command
mount /udev/sda1 /mpoint
and then copy and paste the following lines:
cp /mpoint/A500-proxy-1.0.beta9.tar.bz2 .
tar xvfj A500-proxy-1.0.beta9.tar.bz2