Arduino not able to load program

I was experimenting with the watchdog timer and i accidentally set the time too low and now the board is bricked with only the "L" light keep flashing. Does anyone know how to unbrick the board? Thank you for your attention.

If you get a new sketch ready to upload, then power off the board, power it back on with the reset button held down. Release the reset button just as you upload the sketch. It should get the new one before the old one has a chance to run.