As we all know, for iPhone 12 series, APPLE has blocked the true tone function when people replaced an aftermarket screens, even they choose an OEM screen. For iPhone 8-XS series, the true tone function will lose when replacing the original display. This issue can be solved by writing the internal code through the code writer. For iPhone 11 series, this issue can be solved by moving the IC module, the cost is greatly increased, and it is extremely manual, which easily damages the screen. For iPhone 12 series, even moving the IC module cannot solve this problem before.

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