Factory Image

Does anyone know if I can get the factory image for the Zenfone 5 ZE620KL? I unlocked the bootloader but didn't do anything but now I want to lock it again to get back play protect certification.
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Does anyone know if I can get the factory image for the Zenfone 5 ZE620KL? I unlocked the bootloader but didn't do anything but now I want to lock it again to get back play protect certification.
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Or does upgrading to Android 10 beta and then downgrading to Android 9 also lock the bootloader?