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: Never turn off the power during a flash update, as this can corrupt the motherboard.

: These are compressed folders. You must extract them on your computer to get the actual data file. Download dump ChannelsSR 880HDExtreme rar

Power on while holding the or Menu button on the front panel (depending on the specific hardware version) until the "USB Upgrade" screen appears. Flashing (Standard Update) : Go to Menu > Expansion > USB Menu . Select the file and press OK to start the update. : Never turn off the power during a