The Asus ZenFone 5Z (ZS620KL) Go to product viewer dialog for this item.

The screen was black. Not the black of a device turned off, but the void of a device that had forgotten it was alive.

It is closest to what manufacturers use to flash the OS onto brand-new devices at the factory.

The ZenFone 5Z has a sleek and premium design, with a 6.1-inch Full HD+ display that's perfect for watching videos and browsing the web. The screen is bright and vibrant, with good color accuracy and decent brightness.

But in the “About Phone” section, under “Model,” it no longer said ZS620KL .

Raw. True raw. No partition signing. No bootloader handshake. Just the pure, naked machine code as it left the factory.