Bluetooth cannot be initialized because of COM port open error. How do I resolve?

Answer

For WM6.5/CE5/CE6/WEC6 users, if you see COM port fails to open in sdc_bt log during initialization, it may be worth trying to delay when sdc_bt tries to open COM port. This is because native Microsoft Bluetooth stack also tries to open COM port at boot and and it sometimes conflict with sdc_bt on opening COM port. To try this, set the following registry key in milliseconds. [HKEY_LOCAL_MACHINE\SOFTWARE\Summit\BT] "PatchDelay"=dword