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BT Failed Connection for OX101G and BK10(WM,CE)
BT Module and its Firmware version has been changed from 2.0 to 2.1 due to old one's obsoloted since last Nov. You can see the different version info. from
BTExplorer >> Local Device >> Properties as below. So if you have failed connection problem with some BT devices, you need to upgraded to the version from 2.0 to 2.1.
Therefore, for the connection between 2.1 version of BT devices, "Encryption Link On All Outgoing Connection" option should be checked.
 
[Ref. link for BT 2.0 vs 2.1]
Since 2.1 requires Encryption is mandatory. In Bluetooth 2.0 encryption is optional and can even be disabled.
With 2.1, encryption is mandatory for all connections aside from the Service Discovery Protocol.
 
OLD HCI Version 2.0                                       NEW HCI Version 2.1
 
 
To fix the connection problem, you may need to use one of below 2 methods.
1. Manual Setting On BTExplorer.
Please Navigate to BTExplorer >> Enable Bluetooth >> Show BTExplorer >> Menu >> Settings >> Security Tab
 
2. Patch
Please download the patch from below.
Unzip and copy it to the device and run it.
warning.
- when you run patch, BTExplorer should be disabled.
- This patch will chceck the above Encrypt option only when HCI Version is 2.1.