| How To Fix an iPhone 7 Stuck In DFU Mode. iTunes Error Code 4014 | |
|---|---|
| Device | iPhone 7, IPhone 7 Plus |
| Affects part(s) | Main Logic Board |
| Needs equipment | Soldering Iron, Hot Air Station, Microscope |
| Difficulty | ◉◉◉◌ Hard |
| Type | BGA, Soldering |
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Problem description
How to fix an iPhone 7 that is stuck in DFU Mode. When you try to flash an update or restore, it will fail with Error 4014.
Symptoms
- You get no image from the screen
- You plug into computer and iTunes/3U tools detects it in DFU mode
- If you try to Update or Restore, you get these results:
- iTunes Error Code: Error 401
- 3u Tools Easy Flash: Fails at 19%
Solution
Error 4014 is usually "NAND not detected".
- Check the caps around NAND to see if they're shorted.
- If there's a short, remove the shorted cap and try to boot the phone up.
- If no short, pull the NAND and connect it to the JC P7 NAND programmer and see if it's readable
- If it doesn't read, the NAND is dead and needs to be replaced
- If it does read a NAND, then you can reball NAND and install it again. The phone should boot right up.