Title says it. Can I upgrade my normal battle pass to the premium one?
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I think you can just it will still cost full price, kek 
I think the idea is to encourage you to buy it all in one go for a discount. If they let you buy the bundled passes separately it would defeat the purpose.
Don’t even ask. 343 doesn’t deserve your money, the challenge system is garbage on purpose to try and extract more money out of you this way.