HT1551 led light continuously flickers apple logo appears then no signal indicator   appears , how can I get back original  setting?

Having trouble ,tried giving update and now the led light turns on and off continuosly  apple logo appears for a few seconds then the no signal indicator can someone how I can return the unit to its original settings?

You will need to grab a micro usb cable and restore in iTunes
http://support.apple.com/kb/ht4367

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