iPhone NAND Repair Guide
iPhone NAND Repair Guide
NAND Faults & Communication Guide
Complete explanation about PCIe communication,
SPI faults, Error 4013, Error 4014 and Error 9 diagnosis.
1. NAND Communication Overview
The CPU communicates with the NAND using
high-speed PCIe communication lines .
These lines handle booting, restoring and data transfer operations.
2. AP to NAND PCIe Communication PCIe AP to NAND REFCLK_N PCIe AP to NAND REFCLK_P Faults may cause: Error 4014 Restore failure Boot looping Recovery / DFU issues 3. NAND to AP Communication PCIe NAND to AP REFCLK_N PCIe NAND to AP REFCLK_P Possible problems: Error 9 Error 4013 Data communication failure Restore stuck 4. SPI Communication (Link 0)
During early boot stages, the CPU uses
SPI communication
for NAND configuration.
MISO (Master In Slave Out) MOSI (Master Out Slave In) SPI line faults can cause: Device stuck in DFU Restore complete but no boot Recovery loop 5. PCIe Capacitor Faults
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