| Problem Symptom | Likely Underlying Cause | The Safe Solution | | :--- | :--- | :--- | | Phone is stuck on the manufacturer's logo or in a bootloop (keeps restarting). | , meaning the operating system's core files are damaged. | Flashing Official Firmware using manufacturer-specific PC tools like Samsung's Odin or the Android Flash Tool. | | After a factory reset, the phone asks for a previously synced Google account (FRP Lock). | Factory Reset Protection (FRP) , a security feature. | Use the original Google account credentials or a trusted, specialized FRP bypass tool if you are the legitimate owner. | | You cannot get past the lock screen because you forgot the PIN, pattern, or password. | Screen Lock , where you are locked out of a working phone. | Use the manufacturer's "Find My Mobile" service or a dedicated, secure screen unlock tool. | | A "SIM not supported" or "Invalid SIM" message appears. | Carrier Lock , where the phone is restricted to one mobile network. | Contact the original carrier to request an official network unlock code. |
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