Connect Bluno nano v 1.4 to pc

Hi,

I have Ubuntu 16.06 running on my computer. I am unable to connect to dev/rfcomm0.

Here the steps i followed
bc  ~  bluetoothctl
[NEW] Controller 88:B1:11:57:4E:45 bc [default]
[NEW] Device F4:5E:AB:B1:0F:E7 Bluno
[bluetooth]# pair F4:5E:AB:B1:0F:E7
Attempting to pair with F4:5E:AB:B1:0F:E7
[CHG] Device F4:5E:AB:B1:0F:E7 Connected: yes
Failed to pair: org.bluez.Error.AuthenticationCanceled
[CHG] Device F4:5E:AB:B1:0F:E7 Connected: no
[bluetooth]# pair
Missing device address argument
[bluetooth]# pair F4:5E:AB:B1:0F:E7
Attempting to pair with F4:5E:AB:B1:0F:E7
[CHG] Device F4:5E:AB:B1:0F:E7 Connected: yes
[CHG] Device F4:5E:AB:B1:0F:E7 UUIDs: 00001800-0000-1000-8000-00805f9b34fb
[CHG] Device F4:5E:AB:B1:0F:E7 UUIDs: 00001801-0000-1000-8000-00805f9b34fb
[CHG] Device F4:5E:AB:B1:0F:E7 UUIDs: 0000180a-0000-1000-8000-00805f9b34fb
[CHG] Device F4:5E:AB:B1:0F:E7 UUIDs: 0000dfb0-0000-1000-8000-00805f9b34fb
[Bluno]# pair F4:5E:AB:B1:0F:E7
Attempting to pair with F4:5E:AB:B1:0F:E7
Failed to pair: org.bluez.Error.InProgress
[Bluno]# pair F4:5E:AB:B1:0F:E7
Attempting to pair with F4:5E:AB:B1:0F:E7
[CHG] Device F4:5E:AB:B1:0F:E7 Paired: yes
Pairing successful

I am not sure, why it is failing initially. Later i tried
sdptool browse F4:5E:AB:B1:0F:E7
Failed to connect to SDP server on F4:5E:AB:B1:0F:E7: Host is down

i also tried
sudo rfcomm connect rfcomm0 F4:5E:AB:B1:0F:E7 2 It says "Can't connect RFCOMM socket: Host is down

I am not sure how to proceed.