Hello, I'll tell you a bit about these transmitters. I acquired two second-hand TK-7185-E transmitters to create a project to send data through the external serial port (COM2) and receive it on the other transmitter. The data is a GPS nmea frame. But with the original firmware of the TK7185 I got nothing, I spoke with a technical service and he told me that he barely knew that station but if the TK-7180 and possibly installing the firmware of the 7180 I could make it work, so yes I located the firmware of the 7180 but version K and installed it and now I see that I receive something but the maximum baud rate is 2400 and in principle that is not worth it, so I want to put the original firmware back (Which I do not have) and do tests with the speed that I discovered that if you enter another communication speed it does not work, so I want to try but I cannot locate the firmware of the TK7185E, and I would also like to try with the firmware of the TK7180E since the one I have is TK7180K and the frequencies do not match. And let's see if there's someone kind enough to pass them on to me, especially the one for the TK7185E or TK7185K in the worst case. Thank´s.