Kevin A’s point matters, because it decides which baud the HC-05 has to use: old bootloader is 57600, the new Optiboot one is 115200. The HC-05 has to be set to that same speed with AT commands first.
Kevin A’s point matters, because it decides which baud the HC-05 has to use: old bootloader is 57600, the new Optiboot one is 115200. The HC-05 has to be set to that same speed with AT commands first.