This problem is usually an error with going into reset mode, or failed communications.

Can you double-check all your wiring, and that the rst/flash buttons are still working correctly? IF the CP2102 doesn't connect RTS or DTR to the breakout, then you hold down FLASH and tap RST before starting ...

I have just bought an ESP32 module with a white breakout board with 2 buttons RST & FLASH on it. I try some examples through Arduino IDE and they worked well. But later I received the message like this

"A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header"

I ...