HTC One M7 - won't let me update android version from device (UK)

Hi

Hoping someone can help. I've recently upgraded my phone from HTC One X to and HTC One M7.

When I go into system updates on the phone I get the message "The operation is not allow under GSM network. Please switch to CDMA network"
I live in the UK - is there anyway to update via computer or is this not possible as it seems to be an American phone?

The ebay seller never told me this and has offered my money back. However, it is such a good price and will cost me much more to replace so If I can do manually it would be ideal.

Thanks

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