How to Unlock Bootloader in HUAWEI Y7 Pro 2019 ...
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A: You didn't wait 7-14 days after enabling "OEM Unlock" in Developer Options. Huawei forces a server timer. Keep WiFi on for 7 consecutive days.

Unlocking the bootloader wipes all user data via a mandatory factory reset.

Q: Can I install custom ROMs after unlocking the bootloader? A: Yes, unlocking the bootloader allows you to install custom ROMs.

This article is for educational purposes only. Unlocking the bootloader voids your warranty, wipes all user data, and may trigger safety net failures (breaking banking apps, Google Pay, and Netflix). Huawei no longer provides official unlock codes. Proceed at your own risk.

Go to Settings > System > About Phone and tap Build Number 7 times.