I have installed the new image and update the new version but still I have same problem =(
root@Arduino:~# opkg update
Downloading http://downloads.arduino.cc/openwrtyun/1/packages/Packages.gz.
Updated list of available packages in /var/opkg-lists/attitude_adjustment.
Downloading http://downloads.arduino.cc/openwrtyun/1/packages/Packages.sig.
Signature check failed.
Remove wrong Signature file.
root@Arduino:~# opkg install pyopenssl
Unknown package 'pyopenssl'.
Collected errors:
* opkg_install_cmd: Cannot install package pyopenssl.