Only use on devices you own or have explicit permission to unlock. Bypassing FRP on lost/stolen devices is illegal.
When FRP triggers, the device will prompt you to enter the Google Account username and password that was previously synced to the phone before the reset. While fantastic for security, it creates a massive headache if you forget your credentials or acquire a used phone from someone who forgot to sign out. What is "Romfastcom FRP UPD"? romfastcom frp upd
The success of romfastcom frp upd heavily depends on the device model and its current Android security patch level. Newer patches (2022 onwards) have made this process significantly harder. Only use on devices you own or have