Have installed ESP32 DEVKIT libraries and could select board and comport.
During upload this error message shows, what is wrong?
Arduino:1.8.13 (Windows 7), Board:"ESP32 Dev Module, Disabled, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi/BT), QIO, 80MHz, 4MB (32Mb), 921600, None"
esptool.py v2.6
Serial port COM8
Connecting......................................_____
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header