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Hey guys, I replaced the frame + back + screen (lcd + touch) of my girlfriends iPhone 8. Looks like the wifi only see 5Ghz networks and blutooth doesn’t see any devices. I’ve tried to check many times the antenna etc … but nothing helped, can somebody help me fixing this issue ? Thanks

This could be an issue with the replacement housing. Low quality housings typically have antenna (little known-fact, the antennas are in the housing) or flex issues. You could try to put everything back in the original housing to test and confirm. If you bought a cheapo housing, you may want to order a better quality one, preferably an original/used housing from a reputable supplier.