Change local name of bluetooth module

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I have to change the local name of my bluetooth device. Changing the
host name by calling sethostname and rebooting the system didn't solve
the problem. If I search my device the device name stays as it was
before.
Then I tried to change the name by using HCI commands
(HCI_Read_Local_Name, HCI_Change_Local_Name).

DWORD dwErrorCode = 0;
HANDLE hDev = CreateFile(L"BTD0:", GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);

if (hDev != INVALID_HANDLE_VALUE)
{
DWORD dwSizeOut;
if(!DeviceIoControl (hDev,HCI_Read_Local_Name, NULL, 0, pszName,
249,&dwSizeOut, NULL))
{
dwErrorCode = GetLastError();
}
CloseHandle(hDev);
}

Unfortunatly I always recieve error code 87 which means The parameter
is incorrect.

Thanks in advance for any ideas.

Markus
.

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