Pairing question

i have a homespot Bluetooth audio receiver. Listed on this unit is: model: 4897018467996 - which when searched on this website, has no match. Looking at the manual download section on this website, my unit looks like the one labeled: BTADP-233-40. This is for a home stereo and is plugged into the "tape" input on a Yamaha receiver. This unit worked great for a couple of years but now won't pair with anything. I have unplugged and re plugged unit, with no success. Light on front of unit blinks 4 times, with no variation. Can anyone tell me if I am doing anything wrong here or if there is anyone I can ask about this, or if this thing is just dead?
thanks in advance, John.