Use heat and separate the motherboard.

In the middle layer, the solder pads are wider, and the component distribution is less compact, which simplifies the layering process.

The A18 chip has made CPU repair more challenging because it is embedded deeper. The Apple C1 chip is Apple's first in-house cellular modem, utilizing 4-nanometer baseband technology and 7-nanometer transceiver technology. It is described as the most power-efficient modem ever integrated into an iPhone, resulting in longer battery life.