The iphone12 overtemperature warning cannot be lifted, because it is determined by the system mechanism.
It is because there is a temperature detection system in the circuit design of iOS devices, and there is a complete temperature overtemperature protection mechanism. When the temperature is too high, to avoid permanent damage to the body, a message is displayed indicating that the device cannot be used temporarily.
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The NTC thermistor resistance value of the NTC thermistor decreases with the increase of temperature. When the temperature is too high, the iPhone enters the protection state and stops all programs until the temperature drops to the normal temperature and the protection state is removed.
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NTC thermistor is damaged due to liquid intake, external force and other human factors, or chip is damaged and short-circuit causes the temperature detection system to be damaged. There are several places that cause the high temperature of the iPhone phone, such as: the thermistor damage of the camera, the thermistor damage of the power amplifier power supply, and the thermistor damage of the CPU.
How to undo: You can try closing some apps and restarting your phone to try. When the temperature is too high, the iPhone enters the protected state, and all programs must be stopped until the temperature drops to the normal temperature.
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A heat warning usually comes when the iphone reaches 80 degrees. This can happen because there are too many apps or games open, or it can be that an app or game uses too many hardware resources and generates too much heat. Try closing some apps and restarting your phone.