Arduino mega 2560 pro mini don't recieve data from Serial1

Development Tools IDE 1.x
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So, i want to connect bluetooth module HC-05 to arduino mega 2560 pro mini

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This is what arduino I am talking about. So when bluetooth is in progamming mode, and programming sketch is on arduino, I start to print default AT-command. I print AT and bluetooth doesn't respond in Serial port. Serial port mode is 9600 and NL & CR. And so, experimentally, I found out that bluetooth accepts commands, but does not send an answer. I mean, I managed to change the password and the name on it without responding. Bluetooth is connected to ports 18 and 19, Serial1, as written in the pinout. RX and TX are not reversed, and this module works with other Arduino boards. The problem, as it seems to me, is that the mini version of Arduino Mega 2560 does not work well with additional Serial ports. Is there any way to fix this?

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I have the exact same modules & all the serial ports works fine!

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