I just downloaded the PetoiControllerMac.app (the Qt5 based desktop app) from github. After unzipping it the app does not start (No launch permission). This is on Big Sur (11.6.1). Do I have to rebuild it locally?

Since I got a Bittle kit + Sensor pack I have 2 Petoi Bluetooth adapters. I wanted to use one for Nybble and changed the baudrate to 57600 using AT commands. Worked as described in the manual. Works with Nybble using the Arduino Serial Monitor connected to the Bluetooth port. However now it is not responding to AT commands when not connected via Bluetooth (flashing red led on the module). How do I get the module to respond to AT commands?