I got my Z4 today. It's very interesting, it might be possible to install the Z4 firmware on a Z2. According to aida64, nearly everything internal is the exact same on the two devices.
By replacing the CSC and the rootfs on the Z2 with the Z4 CSC and rootfs, it may be possible to get Tizen 3 on the Z2. Even the displays are configured the same. The displays are both set at 4 inches in the configs
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