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I've been working on m66 and got it connected to PC via usb to serial converter, and got it up and running.

AT

command replies with OK response.

But none of the bluetooth commands are working.

In reference to Quectel_GSM_BT_Application_Note_V1.1.pdf provided by Quectel.

I've tried

AT+QBTPWR=1

but it replies with an error code

+CME ERROR:100

I looked into all reference documentation for this module, but cannot find any refernce to this error.

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Currently the modul is under development and bluetooth isn't fully supported. Your problem should be solved in soon with a newer firmware for M66. http://www.quectel.com/product/prodetail.aspx?id=73

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