I would like to know if it’s possible to put off/on by some pin ? othen than vcc or GND.
If enabled, you can use the Pin sleep function to put the module in a low power sleep state but if you want to Turn it on or off, your only option is VCC.
could you resend the same firmware to get it to reload?
What do you mean by that. If you want to turn of the sleep function, that is just a matter of setting the SM command to 0 on some versions of firmware.
Pin 5 :
Module Reset (reset pulse must be at least 200 ns)
Triggering Pin 5 (Reset) will not Restore the module to default. It will only reset the module.