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iPhone 7 Update System error 9 repair
Machine model: iPhone 7
Fault: Update System reported error 9
iPhone 7 Update System error 9 repair figure 1.
Maintenance: Try to use iTunes to brush 11.4.1 without the progress bar, and Update System reported an error of 9.
iPhone 7 Update System error 9 repair figure 2.
Use 12.0 Update System to go to 80% of the progress bar, which is also an error of 9.
iPhone 7 Update System error 9 repair figure 3.
Remove Nand and measure Nand PAD diode value,VCC is normal, replacing Nand with a new one is invalid, and Nand is still faulty.
iPhone 7 Update System error 9 repair figure 4.
Update System passed after replacing logic EEPROM. Troubleshooting.
iPhone 7 Update System error 9 repair figure 5.
To prevent the design defect of 7th generation PCB layer Baseband S5 GND pin from breaking and burning Baseband to no serviecs, remove Baseband power supply, scrape Baseband out of 98 pin, make the wiring stronger with tin, and replace Baseband power supply.
iPhone 7 Update System error 9 repair figure 6.
The startup test machine is normal, and the maintenance is over.
iPhone 7 Update System error 9 repair figure 7.
