The HC-05 modules that I have purchased from HiLetGo do not work properly. I have gotten both into command mode, only to discover that I cannot get the chips to respond to any commands unless their communication leads are wired incorrectly (see wiring break down below) . When in AT mode, the chips do not respond to the PAIR, INIT, RMAAD, and INQM do not work at all. The bind command will not respond at all unless the last six characters in the xxxx,xx,xxxxxx parameter are all letters, and even then the bind parameter will remain in the default. The INQ command appears to put these chips into the inquiring state, though it will not print ok to the screen.
I have reset these chips multiple times, and still, they refuse to connect or change from their default bind state.
Wiring break Down chip -> board:
GND -> GND
TX -> TX
RX -> RX
VCC -> VCC
I know the TX and RX are wired up in reverse, I have no idea why but this is the only way to get these chips to respond to any AT commands.