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HI Everybody, I''m Mr Hui from GLon.
Please let us introduce to you guys
Iphone 7 can't activate during repair.
we do at first format.
we found out that is error 56, when we do format using IOS 11.
but when we format run with IOS 12, it is passed.
but can't activated.
because format with IOS 11
we need to verify NFC circuit.
but IOS 12 no need to verify.
that's why
formating error 56 is cause by NFC IC circuit default.
we decide to remove the NFC IC and test the voltage.
it is NFC B2 area
AP_TO_ NFC_FW_DWLD_REQ is no data
by right it should have 400+-
It might be CPU virtual solder
we need to reball and restall the CPU
now we restall the CPU
test the area B2 again
passed to CPU and the reading is 470, it is back normal.
and after format it is successful.
Summary
AP_TO_NFC_FW_DWLD_REQ
is CPU to NFC download requst
because it will fail when the circuit is disconnected. It will not recognize the NFC circuit.
everyone should know that after Apple launching the IOS 12
They will shutdown the IOS 11 verification.
the problem after format and can't activated
not only buttom of hardisk.
need to re-consider the NFC circult
This is my sharing to everyone here, see you next time. Bye Bye