The is the Test Point (EDL) method , which requires opening the phone, shorting pins, and using IDT (Huawei Download Tool) to flash an engineering bootloader. This is not recommended for 99% of users because one wrong short kills the motherboard.
The unlocking process automatically triggers a factory reset. Back up all photos, contacts, and personal data beforehand.
If successful, the output will now indicate that the bootloader is unlocked. When you restart the phone normally, the system will automatically perform a factory reset to clear the sensitive partitions, and upon reboot, you will likely see a warning message stating that your device cannot be trusted. This is normal and confirms the unlock was successful. unlock bootloader huawei y9 prime 2019 verified
Even if successful, there are other consequences to consider. You may no longer be able to receive official over-the-air system updates. Unlocking will also likely break Google's SafetyNet attestation, which can prevent apps like banking services, Google Pay, and some games from functioning properly.
Unlocking the Bootloader on Huawei Y9 Prime 2019: The Complete, Verified Guide The is the Test Point (EDL) method ,
fastboot reboot
Unlocking the bootloader breaks the official Huawei Over-The-Air (OTA) update system. Do not attempt to update via system settings, as it can brick the device or re-lock the bootloader. Back up all photos, contacts, and personal data beforehand
Unlock via fastboot (example command)