Update to Jelly Bean from ICS - how?

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http://forums.androidcentral.com – I'm not totally clear how you update from ICS to JB if you didnt buy the phone locked to a particular network. I have a HTC One S and am living in the Middle East, I didnt purchase the phone from the phone company and this model is not supported by the carrier. Is there a way you can update the software without waiting for the phone company to download it (possibly never)? (HowTos)