Hi @sai_kirn ,
seems you are using an ESP32 DevKit ...
If yes you may try this:
- Start an upload and
- press the "Boot" button while the software tries to connect
You may release the button when the upload has started.
See also here
https://forum.arduino.cc/t/esp32-boot-fix/703572
Just a try...
If it doesn't work please post brand and type of your board!
[Edit]:
You may also find a description of the solution that @MaximoEsfuerzo posted above here