In the command prompt, verify that the PC recognizes the device in Fastboot mode by typing:
This process will completely wipe all data on your phone (photos, contacts, apps). Back up your data first!
Before attempting any unofficial method, ensure the following:
Since the free methods are defunct, obtaining a 16-digit unlock code usually requires paid third-party software tools like DC-Unlocker or physical hardware test-point solutions.
Tap 7 times until you see "You are now a developer!" Go back to System & updates > Developer options . Enable USB debugging . Enable OEM unlocking . Step 2: Get the Unlock Code (Third-Party Method)
This often indicates a driver or connection issue. Try using a on your computer instead of USB 3.0, and ensure you are using a high-quality data cable.