Dear ali-8210, You need a software cleaner, Rs232 cable,an emupgrade, latest version.
first you need to turn off your receiver, communicate with computer by Rs232 cable. open emupgrade.exe. click on browse, choose the cleaner, then turn on the receiver. the software cleaner will be downloaded to receiver.
turn it off again,click on browse choose the latest version 2.56 ( marked as 2.55 in site ) All files are *.BIN. turn on your receiver the latest software is downloaded. All this files are available @
http://www.satsw.com but unfortunately it's protected now.