Hold the button and connect the phone to your PC via USB cable to enter Fastboot Mode . Open the command prompt on your PC in your ADB folder.
fastboot reboot
A specific "test point" on the motherboard must be shorted to ground using tweezers while plugging in the USB cable. Unlock Bootloader Huawei Y9 Prime 2019
Unlocking the bootloader on a Huawei Y9 Prime 2019 is highly difficult because Huawei officially stopped providing bootloader unlock codes in 2018. Standard methods like using ADB and Fastboot commands will not work unless you already possess a unique 16-digit unlock code.
Since 2018, Huawei stopped providing official bootloader unlock codes. This has left many Y9 Prime 2019 owners stuck with stock EMUI. But where there is a will, there is a way. Hold the button and connect the phone to
If you need root access to remove Huawei bloatware or extend the phone’s life with a custom ROM (like LineageOS 20 for Kirin 710), then yes – it is worth the effort. However, if you simply want a faster phone, consider debloating via ADB (no unlock required) instead.
After the bootloader is unlocked, your device will reboot, and you'll see a warning message indicating that the bootloader is unlocked. You can now: Unlocking the bootloader on a Huawei Y9 Prime
Because Huawei no longer offers an official unlock service, you cannot use fastboot oem unlock like on Google Pixels or OnePlus devices. You must use third-party paid services or exploit-based tools.