SamyGO

there is some otn servers responsible of direct online update if you have tv with net

eu.otntest.firmware.s3.amazonaws.com
us.otntest.firmware.s3.amazonaws.com

eu.otn.firmware.s3.amazonaws.com
us.otn.firmware.s3.amazonaws.com

did you try update this way? the firmwares seems to be outdated (and hard -encoded - salted).

yes ,but failed because a ihave wrong model set in firmware to c7700 (i have c8000) and i cannot set back greeyed option in firmware must downgrade