Bluetooth doesn't work, just forever spinning

Hi iFixit,

I recently repaired the screen of a broken iPhone X using your site, super helpful! The only thing that doesn’t seem to work now is the bluetooth, as it’s just stuck spinning. I’ve tried everything to fix it, but I think it’s a hardware issue.

I bought the top right bluetooth flex to see if replacing that would solve it, but I can’t find instructions for it anywhere. Please can you point me in the right direction?

If that doesn’t work, then I imagine it’s a motherboard soldering problem. Any idea where I could get instructions for that also, as this will be my first time doing it.

Appeciate any help!