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You can't.
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Yes you can if he has it that weekend
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Doubt it.
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Xûr upgrades even exotic weapon bounty weapons I bet he does
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We'll see
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he probably wont because vex was obtained through VOG it is exclusive to only VOG this is why i don't think xur will have the option for the upgrade. but one can dream and hope...and when it comes to this i really hope you will have the option to upgrade.