Sdx — Download Gx6621 Databasev66

Ensure your receiver actually uses the GX6621 chip; installing an .sdx for the wrong processor (like GX6605) may result in an "Invalid File" error or a boot loop.

Go to Menu > Expansion > USB (or Settings > Upgrade ). Select: Highlight the .sdx file and press OK . Download GX6621 DatabaseV66 sdx

Always "Dump" or "Upload" your current channel list to USB before installing a new one so you can revert if needed. Ensure your receiver actually uses the GX6621 chip;

Only download from trusted community forums (like Belal Sat ) to avoid corrupted files that could freeze your device. Download GX6621 DatabaseV66 sdx

The receiver will ask "Do you want to update database?". Select Yes .