HU Echo does give old COs. You'll still have to unlock them. I think you also need to bring along FO Echo and not HU Echo for the COs that require her to join you.
On Matterboard 13 I was able to complete the required Bingo CO.
Edit:
When the patch fails, try cirnopedia. When cirnopedia fails, try the JP wiki. Or just go to the JP wiki first if you're willing to deal with moon runes.
Did you do all this?Originally Posted by cirnopedia
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