I have my Beta / pre production boards assembled, and when I fire up the board, it has an application already loaded into it, If I start Cysmart android app, it says EZ-Serial and the app can only do GATT db where it shows unknown service.
My question is where is the documentation for this? I can not find any.
Also, is this some kind of wireless bootloader? if so how does this work?
The Module is factory default loaded with EZ-Serial Firmware. Please find the user guide and all the required information from the below link.