My xpriv just quit working, when i first out the batteries in the display will come on like normal, then go off like normal, but when i hit the fire button 5 times fast nothing happens….. so i tried the method i read above about holding all three buttons down then hooking it up to usb charger then put batteries in while still holding all buttons so i held all three buttons down and hooked it up to usb but couldn't get the batteries in while still holding the buttons down so i gave up, then i reinserted the batteries and hit the button 5 times quickly and it turned on….. it's now working, my question is is this thing safe now?????????