Never try to flash the .rar file directly. Extract the .bin file inside first.
Use the USB → Menu → Tools → Dump by USB path to first back up your current working software.
This firmware does not include modern security patches. Furthermore, .rar files from unverified satellite forums frequently contain malware disguised as bin files. Stability
GX6605 is a broad family (GX6605, GX6605S, GX6605C). Flashing the wrong variant's firmware can "brick" the device (Red Light error). Installation Best Practices
While this specific .rar file may contain the firmware you need, it comes with significant caveats: Evaluation
2019 was a major year for YouTube API changes; this software version typically included the necessary "API Key" updates to keep the YouTube app functional on the receiver.