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[bluetooth-dev] Problem with HCI_Ericsson_Set_Uart_Baud_Rate

I have a Bluetooth module Ericsson ROK 101007/21 FCC and I can't change
the UART baudrate using the function HCI_Ericsson_Set_Uart_Baud_Rate
(opcode 0xfc07). I can use only 57600 bps, and when I try to change the
baudrate (I have to use 115200 bps, parameter 0x02), the module answer with
a Command Complete Event at 57600 bps, but it doesn't change the baudrate, and if
I try to issue a Command at the 115200 bps it returns me a Hardware error
event (code 0x04 0x10 0x01 0x20). I try to change the timing (Ericsson specifics
say to change the Host speed within 500ms) but nothing. What have I to do? Thanks.