The modules with theĀ HC-04Ā andĀ HC-06Ā firmware are the modules which are factory set to be Master or Slave modules. Master and slave mode cannot be switched from the factory setting. HC-04 is an industrial grade product, HC-06 is a commercial grade product.
The modules with theĀ HC-09Ā firmware are replacements for the HC-06 and HC-07 modules.
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