I'm having some problems on Fastrack M1306B Modem

Hi all,

A few days ago, I bought a Fastrack M1306B Modem. I have integrated it with my software that is running on Window 7.
I configure the RS232 port of the DTE as follows:
Bits per second: 115.200 bps,
Data bits: 8,
Parity: None,
Stop bits: 1,
Flow control: hardware.

My problem is that data transmitted from the modem is wrong a few characters.
For example: M transformed into L, (carriage return) transformed into (NP form feed, new page).
This problem does not occur frequently. But I need absolute accuracy data.
Please help me how to resolve this problem.

Which firmware version are you using??