Doc: Updated Troubleshooting file

docs/source/troubleshooting.rst

@@ -1,5 +1,5 @@
 ###############
-Troubleshotting
+Troubleshooting
 ###############
 
 Common Issues
@@ -18,10 +18,23 @@ Building
 Flashing
 --------
 
-* The board is not flashing.
+*Here are some of the tips if The board is not flashing..*
+
+* In some instances, you must keep **GPIO0** LOW during the uploading process via serial interface.
+* Hold-down the **“BOOT”** button in your ESP32 board while uploading/flashing.
+* In some ESP32 development boards when trying to upload a new sketch, the Arduino IDE gives you a fatal error *(i.e A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header).* This means your ESP32 board is not automatically in the flashing/uploading mode.
+**Solution:** 
+
+1. To automatically get into the flashing mode, you have to connect a **10 uF** capacitor between the **EN** and **GND** pins. This capacitor value could be lower (> 2.2 uF) if you don't have this part available. **EN <----||---- GND.** *(The capacitor can be electrolytic, ceramic, or tantalum. Using lower values like 2.2uF and 4.7 uF is also possible in most cases.)*
+2. The hardware guide recommends adding the RC delay circuit. For more details, see the **ESP32 Hardware Design Guidelines**
+  https://www.espressif.com/sites/default/files/documentation/esp32_hardware_design_guidelines_en.pdf 
+
+  ``in the '2.2.1 Power-on Sequence' section.``
 
 Hardware
 --------
 
-* Power Source
-* Bad USB cable or charging only cables
+* Power Source.
+* Bad/damaged USB cable or charging only cables (without data wires).
+* USB drivers missing.
+* Board with some defect.