Firmware Build

The Product ID in SYS_RESET_IND or SYS_VERSION message indicates the module hardware.

Oct. 18, 2012 Release:
 * 0x20: A2530R24A - no range extender
 * 0x21: A2530R24C - no range extender
 * 0x22: CC2591 range extender (not released to production)
 * 0x23: A2530E24A - CC2591 range extender
 * 0x24: A2530E24C - CC2591 range extender