[HELP] unrooted phone without uninstalling xPosed

Hi, I have a Wiko Highway that I want to send to warranty.

So i had my phone rooted, and unrooted it and then factory reseted it, but i forgot to uninstall xPosed and its modules.
Now i started to install some apps so i dont send the phone empty, and when installing snapchat it wont let me login (as it block's rooted phones)
So, by some way snapchat "thinks" i'm still rooted, i'm afraid the provider can tell that :/

Is there anyway to prevent this?

Thanks

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