Hello @ankit17340
ok, good. One more thing, do you manually put your STAMP into download mode by holding the 'boot' button and pressing 'reset' on your USB UART download setup? If so try the same before clicking the 'Configuration' button in M5Burner.
Explanation: changing the configuration uses the same mechanism as burning firmware, just for a tiny part of the flash only holding the settings.
Thanks
Felix