Actually there no firmware is running within this module it is hardware problem.
There is always some firmware running unless you keep the reset button pushed or the device is broken.What happens to the LED when you keep the reset button pressed? If it is still on, there is a short somewhere. The RGB LEDs are active low. If it is off, something is configuring that I/O pin to output after reset.
This same problem happening on three board not in one only.
Can you tell me why this module getting HOT while I power it although there's no shorting in power supply and other components.?
Mmmm...Did you use any additional hardware with the boards?Any chance you used some wrong settings (e.g. other device) in the Arduino IDE?
This is not a good sign. The module should not be able to get hot under normal operation. The same module casing is using for other designs (e.g. NINA with WiFi) which can draw a lot more power.
Currently it is no functional mode. Neither it accepting any sketch from Arduino nor running any sketch within it. PC also unable to discover it USB port.