1. Used to read and write USB_C ROM chip data (CD3215 and CD3217) 2. U301 contains the original ROM data of the 2016-2020 USB_C chip, a total of 26 3. The Type-C circuit of the MacBook adopts the 5V-20V boost process. If the ROM data of USB_C is damaged, the motherboard will only have a 5V power supply. 4. When the power supply of the MacBook motherboard changes from 0V to 5V, it means that the USB_C ROM data is damaged. 5. Use the U301 tool to write the ROM data of the corresponding model, so that the motherboard power supply is normally boosted to 20V
Applicable models
1. Applicable to all MacBooks with Type-C interface from 2016 to 2020 2. The USB_C chip of the MacBook from 2016 to 2018 uses CD3215 3. The USB_C chip of MacBook from 2019 to 2020 uses CD3217
