HM-TRP modules, start from the beginning

I just bought a couple of  HM-TRP 868GHz Hope modules and I would like to make a telemetry system.

I have been loking for the information in this 3DR part of the forum but I think a bit dumb  I couldn´t find the information.

I just try to use the modules as they com from the factory.

Y make two test boards and one of them I conected to a FTDI 

I conected this way

FTDI         Module

VCC         3,3V regulator  VCC

GND         GND

TX            Rx

Rx           Tx

DTR         NONE

CTS         NONE

I start from changing the baud rate   with the AA commands

I have send some AA  sentences from a Hyperterminal Program connected  @ 9600bps with the Com port (USB) 

I type the sentence

AA FA C3 00 00 E1 00 to change the wireless baud rate (57600) and the module record this parameter

When I type the nest sentence, 

AA FA C3 00 00 E1 00  to change the UART baud rate (57600) after I send the sentence  I could not talk to the module anymore.

I did a new connection with 57600 baud rate but it does not answer the correct answers. I have answers but it looks like is in another baud rate.

I don´t know how to go back and star from the beginning.

I just thought  to star changing the bootloader and the firmware to conect them to the 3DR program.

Can anybody tell me something about how to change the boot and the FW.

Thanks a lot.

Alberto

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