In what sense do you mean 'upgraded', if you mean the maps, it depends if you have MIB1 or MIB2, if it's an early 2015 then you probably have MIB1, I think the SD card has to be replaced with a new one for later maps.
So, I'm assuming what you mean by 'upgrading' is a software update? If this is what you want there are a few posts about this on the Forum, quite a bit of reading though.
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