1. Mars software does not support USB upgraded old UI software
2. Before the old software upgrade Mars, back up the database and data
3. Mars does not support old software channel lists
4. List of SDX program supported by Mars
5. If the HD program has no sound, please try to modify Settings->System Settings->Digital Audio->RAW
V9Prime upgrade Mars：
1.To upgrade the V9Prime mars firmware from the original V9Prime firmware, you need to copy the backdoor.key and V9Prime mars firmware files to the usb root directory.
2.then enter the "upgrade by usb" menu, select the upgrade mode as 'All code', do upgrade.