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You will likely need a USB-to-RS232 loader tool or a CH341A programmer if the device is unresponsive to standard USB updates.

before flashing, as using a dump for a different board revision can permanently "brick" the receiver.

You can find the dump file for the (board GS4901DC) on several community firmware forums and file-sharing sites. These files are typically used to fix "boot" loops or "on" status errors caused by incorrect updates. Download Links: A direct RAR archive for the CX300 mini HD hybrid