Blue Tooth Pairing?

[MrVvrroomm]

Before you start connecting anything do the following:
Factory reset your Sena (refer to your documentation)
Delete all TFT connections on bike.
Delete all Nav VI pairings.
Delete all pairings on your phone involving Nav VI, TFT, Sena.

Do these in this exact order:
1) Pair helmet (Sena in your case) to TFT.
2) Pair helmet to Nav VI
3) Pair phone to TFT (you'll have problems with your S4)
4) Pair Nav VI to phone (don't sync Contacts or Favs) on Nav VI deselect phone symbol, select Smartphone Link (if installed on phone)
Nav VI is not directly paired to TFT. TFT is used as hub.
You should only have to go through this pairing once.

Here's my startup procedure:
1) Make sure helmet is OFF
2) Press keyless button to power up bike. This will start up your Nav VI as well.
3) TFT will grab your phone, wait. Don't start turn on helmet yet. You will see Bluetooth symbol flashing on TFT next to your phone connection.
4) Wait until Bluetooth symbol stops flashing.
5) Start helmet.

This is what works for ME, every time. Your results will vary. Your phone is the weak link. I use S8.

I don't believe your radar detector Bluetooth connection needs to connect to TFT. It is connected for audio to your helmet. I don't do radar detectors.

BMW's latest software version is: 021-104-020 as of June 7, 2020.

I've been able to replicate this procedure with old ver. 001-019-180

Newer software is better.