The Go 50 generally comes with either Europe or Western Europe maps, the Europe map is now to large for the available memory so you will keep going around in circles if that's what you are trying to install. I just had this same problem with an Go 60 which my m8 bought off fleabay, even an sd card was not recognised.
After completing the steps outlined above I think I clicked on manage maps and the chose just the UK & Ireland map which installed with no problems and the sd card was then recognised. After this install I then went to my content in mydriveconnect and was given the option to change map where I chose the Western Europe map which installed no problem. The Western Europe map is about 5.6gb where the Europe map is around 8.5gb, the available memory in the Go 50 is 8gb hence the problem. I had a look on the TomTom forums and saw that many people had the same problem as you, I played with it for a while and either got lucky or found the answer to the problem myself.
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