You are now locked out. This is , a mandatory security feature introduced with Android 5.1 Lollipop. While FRP is excellent for deterring thieves, it is a nightmare for legitimate owners who forget their old credentials, buy a used phone from an uncooperative seller, or inherit a device from a family member.
Flash a "Combination ROM" (factory test firmware) that disables FRP, then flash back stock ROM. Samsung A20 Frp Unlock Tool
Introduction: The Frustration of Factory Reset Protection Imagine this: You’ve just performed a factory reset on your Samsung Galaxy A20, either to fix a software glitch or because you’ve bought a second-hand device. You power it back on, feeling hopeful for a fresh start. Then, the screen turns white. A message appears: “This device was reset to continue, sign in with a Google account that was previously synced on this device.” You are now locked out
Never pay for a tool before trying the free methods. Always scan downloaded tools with VirusTotal, and remember—if a tool promises to unlock your phone in 10 seconds, it is likely malware or a scam. Flash a "Combination ROM" (factory test firmware) that