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iPhone 7 can’t start Keep data maintenance
Machine model: iPhone 7
Fault symptom: the mobile phone can’t start Keep data
Maintenance process:
Received a iPhone 7 from the customer, and the customer described Keep data.
First, even the computer found that the machine was in DFU mode, tried to quit DFU mode, and found that it was impossible to quit DFU mode.
iPhone 7 can’t start Keep data Maintenance Figure 1
In this case, we usually consider Nand first, because customer Keep data, so we need to call customer Nand first, and ask if it is possible to remove the tester on Nand to see if Nand is broken. Call customer and ask if Nand is approved, then remove Nand first.
iPhone 7 can’t start Keep data Maintenance Figure 2
On the test stand,Nand can read it, and then type Nand Nand again. The values are all normal. When the customer called, he mentioned falling. After using no booting for a few days later, he felt that Nand PAD might be more likely. Repeat Nand again, and the data was saved after successful startup.
iPhone 7 can’t start Keep data Maintenance Figure 3
Ask the customer for the power-on password, and the power-on test shows that all functions are normal, and the maintenance is over.
