Q1: I am trying to configure the adapter to change the BAUD rate. I downloaded your android app. I successfully connected to the BT578_BLE on the app. However, when I send a AT command there is no reply. When I look at the adapter, the power light is on,  the bluetooth light is solid once I connect to the app. When I send a AT command the Serial Data Activity LED briefly flashes and then turns off. I have tried to send the AT commands while pressing and holding the  AT command button but I get no reply. Could you please advise?

A1: BT578V2 does not support AT command via Bluetooth wireless connection, you have to send AT command via RS232 physical connection.
You must connect BT578V2 to a serial port of your computer to send AT command.  If your PC does not have a serial port, please buy a USB-RS232  cable to add a physical COM port to your computer.
Our another product, BT580, can support remote Bluetooth AT commands. http://www.irxon.com/english/products/bt580_en.htm


Q2: Windows 11 can't find BT578 V3.

A2: If you don't see your BT578/BT579/BT580 device displayed in the list of devices in Windows 11, you may need to set your Bluetooth devices discovery setting to Advanced.

1. Select Start  > Settings  > Bluetooth & devices  > Devices .  

2. Under Device settings > Bluetooth devices discovery, choose one of the following from the drop-down list:   
Default—displays common Bluetooth devices  
Advanced—displays all types of Bluetooth devices

In Android 6.0 and higher version, a coarse location permission is needed to run Bluetooth searching.

When you run "ATBlue" or "Blueterminal" for the first time, please give the APP location permission, select "While Using" or "Allow".