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Hello, Sorry you're having problems. The list of supported Sony TV's for Amazon Prime are at the link below- and the KDL-50W800C is not listed as being supported:
While you can try to get the code for the KDL-50W800B, and see if that will work- there is a chance that the suffix "C" will not be supported.
In that case, an external device such as the Amazon Firestick would be needed and would simply connect to one of the TV's HDMI ports and will stream Prime directly from the stick. These can be purchased for around $40 at Best Buy, or directly at the link below:
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