Halo 3[Xbox One] - Legendary Campaign Issue

So I’ve completed the campaign on CO-OP on legendary and unlocked EOD Helmet (You unlock this helmet by completing it on legendary). But when I go to my service record, it says I’ve only completed it on Normal. On solo campaign I have all the missions done on Normal except for Arrival, which was done on legendary. how do i fix my service record to say the right thing?

I guess that you might end up having to restart the campaign on legendary?

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> So I’ve completed the campaign on CO-OP on legendary and unlocked EOD Helmet (You unlock this helmet by completing it on legendary). But when I go to my service record, it says I’ve only completed it on Normal. On solo campaign I have all the missions done on Normal except for Arrival, which was done on legendary. how do i fix my service record to say the right thing?

Did you have it completed on Legendary on Xbox 360?

try to finish the mission in normal.