If you turn the configuration mode on, and then go to flashing mode (Four pulls of the trigger) and hold the trigger on flashing, until it flashes the mode you are on, 1,2 or 3 and then when it stops, pull the trigger 4 times and stop. Change back to the firing mode, pull the trigger 3 times pretty fast, on the fourth or fifth just hold it.I'm not sure on this, but I think that not all PMR's have the hidden full auto mode on it. I was teching mine on Sunday and it wasn't there. The Dye tech couldn't find it either.