If the box is completely dead, you must remove the Flash IC and use a hardware programmer (like CH341A). Disconnect power and open the casing.
If the device is "bricked" or stuck on the logo after a bad update: Rename your working dump file to (depending on the specific chipset version). Place it in the root directory of a USB drive. dump starsat sr5090 hd extreme
An SOIC8 flash clip tool (to read the chip without desoldering) or a soldering station to remove the chip. If the box is completely dead, you must