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Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus. Identifiable by the model numbers A1549, A1586, and A1589.

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Flash iOS in DFU mode stop at random NONCE

iPhone 6 have problem with totally dead screen and the only thing showing that something is alive is that I can get it in DFU mode. I don’t get the serial number or other information about the phone and when I try to flash it after loading iBSS it fails at “reading random NONCE”.

Obviously the power and home button work, after measuring I also know that it’s charging. I got the phone from a friend and what I know the screen has been replaced by professional and after that the phone worked for a few months before this it just died one day.

Any idea where to start, NAND maybe?

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Looks like NAND, are you getting iTunes restore error 4013?

Could be CPU not getting voltage, shorted, NAND chip need replacement / reprogramming.

Usually it's NAND in this case.

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I got error 4005 in iTunes. Take away and reball or can it be an idea to put something under that puch it against the motherboard.

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It's a board level issue:

http://forum.gsmhosting.com/vbb/f631/iph...

Looks like reprogramming the NAND and reballing it to put it back on needs to be done.

Reballing NAND could work without reprogramming the NAND but that sometimes isn't enough.

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Ok, I don’t have tools to reprogram it. Maybe not the soldering skills either but since it not working as it is I don’t lose anything to try. Just heat it up is no idea to try.

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I have now tried to heat up the NAND and after I put the phone together again It starts up and run normally for about 10 minutes then died.

Don’t know if I should go one more round with just heating or try to take it off and reball.

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