Bluetooth Pairing on Dual Boot

Dual Boot Bluetooth

When pair your device, Bluetooth service generates a unique set of pairing keys. So twice pair will generate two differen keys. Simplely synchronizing two pairing keys can solve it.

Sync pairing keys

• Pair device once on Windows and Linux.
• Mount Windows system partition on Linux.
• Use chntpw to change the pairing key in Windows.

Get the pairing key

cat /var/lib/bluetooth/<current_computer_bluetooth_mac>/<device_mac>/info 

...
[LinkKey]
key=YOURDEVICEPAIRINGKEY
...

chntpw -e WIN_PATH/Windows/System32/config/SYSTEM

> l
Node has 17 subkeys and 0 values
  key name
  <ActivationBroker>
  <ControlSet001>
  <DriverDatabase>
  <HardwareConfig>
  <Input>
...

Replace ControlSetXXX with the value of your system.

cd ControlSet001\Services\BTHPORT\Parameters\Keys

(...)\Services\BTHPORT\Parameters\Keys> l 
Node has 2 subkeys and 0 values
  key name
  <144f8a...>
  <35d48b...>

Edit Windows pairing key

> cd <computer_bluetooth_mac>
> l
(...)\BTHPORT\Parameters\Keys\<computer_bluetooth_mac> > l
Node has 0 subkeys and 1 values
  size     type              value name             [value if type DWORD]
    16  3 REG_BINARY         <25f3e8ad4ce5>
    16  3 REG_BINARY         <device_mac>

Don’t forget add space

ed <device_mac>
.: 0 YO UR DE VI CE PA IR IN GK EY
.s
> q

Reboot, and now there is no need to pair again after each system switching.