Update bt_manual_v10.md

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@ -204,7 +204,24 @@ Discovery started
[agent] Enter PIN code: 1234
[bluetooth]# quit
```
If bluetoothctl fails to pair without prompting you for a PIN code, use the remove command to remove it, turn off pairable, turn off scanning, and try the bluetoothctl commands above:
```[bluetooth]# pair aa:bb:cc:dd:ee:ff
Attempting to pair with aa:bb:cc:dd:ee:ff
Failed to pair: org.bluez.Error.ConnectionAttemptFailed
[bluetooth]# pair aa:bb:cc:dd:ee:ff
Attempting to pair with aa:bb:cc:dd:ee:ff
Failed to pair: org.bluez.Error.ConnectionAttemptFailed
[bluetooth]# remove aa:bb:cc:dd:ee:ff
[DEL] Device aa:bb:cc:dd:ee:ff aa-bb-cc-dd-ee-ff
Device has been removed
[bluetooth]# pairable off
Changing pairable off succeeded
[CHG] Controller 00:00:00:00:00:00 Pairable: no
[bluetooth]# scan off
[CHG] Controller 00:00:00:00:00:00 Discovering: no
Discovery stopped
```
#### 5.2.2 Fast connection using dedicated USB Bluetooth adapter under Linux
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