Box Serial number is PAX501852441 Model M7 Hello, We took our bad TDA and exchanged it. Got it home and hooked it up and got the Error 340 message. Called comcast and they did their best but suggested we get a tech or swap out the box. We drove another 20 miles to take the box back and got another (listed above). Same thing. Error code 340. Do I have a box meant for X1 even though we do not have X1? I got.frustrated and ordered a X1 self install kit. We have 5 TVs and currently all work except for the new box. We even put one of the other boxes where the new one should be and the old box worked fine. Any ideas? Comcast customer service is stumped as well.
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