In-case of software issue for models SS_6565,6464 you can use their file and put in USB Flash and rename file name to Rom.bin and after inserting USB device to receiver you press and hold power-button on front panel and turn on receiver from switch. it will quickly upgrade and get back to normal condition.
for model SS9200,9300 V8 Rename software to Gxrom.bin and put on USB and turn on receiver and wait to finish upgrade and unplug USB and restart receiver.