Ok. My friend decided to go to Xiur on my Hunter. He told me I could upgrade My Exotic Thorn by just re-buying the Thorn or something. It said I needed the Thorn, an exotic shard and enough glimmer to do so. I told him he could do so if it upgrades it. So when he bought it, I got a completely brand new Thorn rather than an upgraded one. My original Thorn was halfway upgraded. Help please.
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Xur's exotic upgrade system, upgrades pre-expansion level exotics (300 max attack weapons, 30 max light armor) to expansion levels (331 max attack, 36 max light). As a result, all experience on the weapon is reset. Attempting to upgrade an expansion level exotic, will only result in the reset of experience on the item. https://www.bungie.net/en/Help/Article/12457
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This section of Xur's inventory is for upgrading exotics with pre-DLC stats(300 damage 30light) to post-DLC status(331 damage 36 light). It also resets a weapons upgrade progress. Since your weapon already had post-DLC stats you do not need to upgrade it. See the link below for more details. [url=http://www.bungie.net/en/Help/Article/12457]Exotic Upgrade FAQ[/url]