Cannot send AT commands anymore to JDY-19 after baud rate change

[misterbirra]

Hello, I'm playing with Arduino Zero and the JDY-19 bluetooth module (datasheet: https://robokits.download/downloads/RKI-4640%20Datasheet.pdf)

I tried sending some AT commands. By default, the baud rate is set to 9600. The RST pin is HIGH and I can correctly send the commands with this sample code:

Serial1.begin(9600);
while(!Serial1);
Serial1.println("AT+VER");
Serial1.flush();
String reply = Serial1.readString(); // OK, returns something like "JDY-19-Vxxxxx"

Then I wanted to change the baud rate to 115200. The datasheet is not really clear on this:

It seems that "11520" is just a typo and is should be "115200".
Also, it is written "Param: (1-9)" while the scale goes from 0 to 6.

Anyway..... I supposed that I should send "AT+BAUD0". I did it, and now I cannot communicate anymore with the module
I tried with Serial1.begin(115200); but also 9600, 11520, 2400 and so on... but now Serial1.readString(); is always empty.

Do you know why? I'm worried that sending "BAUD0" was a bad idea. Any way to do a factory reset via hardware?

[gilshultz]

@misterbirra

JDY-19

I would suggest you contact your supplier and ask to return it, when they ask why have them explain how to do a factory reset. I found nothing on line to help you.