Apple iPhone

Complete disassembly and replacement guides for the original iPhone, iPhone 3G, iPhone 3GS, iPhone 4, iPhone 4s, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6 and iPhone 6 Plus.

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Shows unknown IMEI and i-tuns will not restore

3gs shows unknown IMEI and ICCID

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Chosen Solution

This is a very bad warning. The problem could be many things, water damage, hardware failure. But lets go with something you can try. A DFU mode restore. Open iTunes on computer. Connect iPhone to computer. First push Home button and then push Power button, count 8 seconds and let go of Power button, keep holding Home button until iTunes says it has detected iPhone in Recovery Mode, then let go of Home button (usually about 15-25 sec). The iPhone screen should be blank (black), if an image is on screen you are not in DFU mode. If in DFU mode then click to let iTunes restore your iPhone. If not in DFU mode, try to enter DFU mode again. Even experienced users can have a bit of trouble entering DFU mode, keep at it until you get it into DFU, iTunes will tell you when (Recovery Mode window), as long as screen is blank (black). Good luck. Brad

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Most times this will end in error 23... Cannot restore. The problem ic requires soldering skills and tools only professional repairers have. Let us know what you get with dfu and how you want to proceed

by pollytintop

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Most Helpful Answer

Most of the time that error is because the battery is not giving juice to the boot loader chip, try first to change the battery since the boot loader only will work from the battery power even so if the phone is directly connected to the outlet.

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+have seen bad battery give these signs many times.

by pollytintop

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This answer was originally to another question.

chang the battery and see if ur battery is deamag it will work.

Update

i agree with u. but some cease is different battery is good imei iccd is unknown.any solution ?

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This answer was originally to another question.

iphone imei unknown iccid unknown

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iphone imei unknown iccid unknown

by rajon

8997103113101650188

by saalam saalam

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This answer was originally to another question.

I used to have the same problem no imei no iccid, after i change battery everything start working.

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it is the battery. I just fixed mine.

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