I must include a necessary disclaimer. Bypassing Factory Reset Protection (FRP) or Samsung KG (Knox Guard) on a lost or stolen phone is illegal. This information is provided for educational purposes and for legitimate owners who have forgotten their credentials. Unlock Samsung A135F KG Lock Permanently: A Deep Dive into GSMKhmerSolution.net If you own a Samsung Galaxy A13 (SM-A135F) and have been hit by the dreaded KG State: Prenormal or KG Lock , you know how frustrating it can be. This security feature, part of Samsung’s Knox Guard, essentially turns your phone into a brick if you try to flash unauthorized firmware or reset the device without proper credentials.