iOS 6 bluetoothmanager pairing private api

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I'm trying to communicate with a 3rd party bluetooth device from an iPhone 4s with iOS6, and using a bluetooth headset as an example.
After checking many guides and tutorials on the subject, I came to the following conclusions:

a -The most suitable way for me to make communication work is to use "IOS bluetoothManager private framework". (I don't need to upload it to app store)

b - The steps are:
1. Find the device
2. Get his info (address)
3. pair
4. communicate

c - Apparently there is no way to make it work :(

I based my app on this: [Bluetooth and iOS – Use Bluetooth in your iPhone apps][1], and wrote my app based on it.

When I run it, the app finds the headset device

xcode output console:

2014-11-30 14:31:57.041 BluetoothNew[146:907] BTM: attaching to BTServer
2014-11-30 14:31:57.050 BluetoothNew[146:907] BTM: enabling device scanning
2014-11-30 14:32:00.451 BluetoothNew[146:907] BTM: found device "UA06XB-B" 20:14:05:12:7A:3B
2014-11-30 14:32:00.454 BluetoothNew[146:907] Name: UA06XB-B
Address: 20:14:05:12:7A:3B
MajorClass: 1024
MinorClass:4
Type:16
BatteryLevelSupport: 0

When I try to pair to the device I get the following message in xcode console:

    2014-11-30 14:32:04.686 BluetoothNew[146:907] BTM: setting pincode '0000' for device "UA06XB-B" 20:14:05:12:7A:3B
    2014-11-30 14:32:04.688 BluetoothNew[146:907] BTM: connecting to device "UA06XB-B" 20:14:05:12:7A:3B
    2014-11-30 14:32:07.303 BluetoothNew[146:907] BTM: attempting to connect to service 0x00000001 on device "UA06XB-B" 20:14:05:12:7A:3B
    2014-11-30 14:32:07.938 BluetoothNew[146:907] BTM: connection to service 0x00000001 on device "UA06XB-B" 20:14:05:12:7A:3B failed with error 158 

connection code:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = (UITableViewCell*)[tableView cellForRowAtIndexPath:indexPath];
    NSString *labelText = cell.textLabel.text;

    BluetoothDevice *device =  [self.currentAvailableDevices objectForKey:labelText];
    BluetoothManager *btManager =   [[self bluetoothScanner]getBluetoothManager];
    [btManager setPincode:@"0000" forDevice:(device)];
    [btManager connectDevice:device];


    // I tried this way too with the same result

    //[device setPIN:@"0000"];
    //[device  connect];
    //NSLog(@"service supported: %d", [device isServiceSupported:0x00000001]);
}

What is the problem?
What is error 158?

Any help would be appreciated.

Slava.