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iPhone 6 Series Repair

iPhone 6 Keeps Restarting? – Fix Error 9 14 40

iPhone 6 Keeps Restarting

More and more people reported that their iPhone stuck in a restart loop. The phone continuously restarts and became totally unusable, the Apple logo appears and disappear, over and over again.

 iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - fix iphone restarting, iphone lcd screen

Does your phone ever meet this common problem which drives you crazy? Now read our post to get some practical tips to fix this issue by motherboard repairing.

1. Take down the LCD screen assembly  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - lcd screen assembly
2. Test voltage of the battery with the digital multimeter. Battery voltage is 4.21V, battery test signal voltage is 2.02V. The battery is normal, so we install the LCD screen assembly to check other malfunctions.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - iphone battery, iphone lcd screen, digital multimeter
3. Failure detection: connect the phone to computer, it could not be restored by iTunes, an unknown error occurred (9) so that we can draw a conclusion that NAND flash or CPU is cracked. iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - error 9
4. Detach the motherboard from the phone, and fix it on PCB holder.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - motherboard, pcb holder
5. Remove the NAND flash chip from motherboard carefully.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - remove nand flash
6. Clean the bonding pad with the soldering iron, knife, BGA paste flux, rosin, solder wick and PCB cleaner.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - clean bonding pad
7. Connect the NAND flash programmer with the computer, transfer the data from the old NAND flash to a new one.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - nand flash chip programmer
8. New NAND flash chip BGA rebelling.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - BGA reballing
9. Install the new NAND flash chip to the motherboard.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - install nand flash
10. Install the motherboard to the phone.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - install motherboard
11. Connect the phone to computer, it can be restored by iTunes successfully.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - iPhone restore
12. Test if it works well. iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - function test

Tips:
1. Prepare a new 64GB NAND flash memory chip.
2. Error 21, 9, 2009, 4005, 14, 40 indicate NAND flash or CPU malfunction. (You can read our What Do All These iPhone Error Codes Mean to learn more)
3. You may need to repair the CPU if the phone still keeps restarting after the NAND flash chip is replaced.

Tools Used:

  • 64 Bit NAND Flash Programmer
  • Mobile Phone Repair Platform
  • Digital Multimeter
  • Soldering Iron Station
  • Hot Air Gun
  • PCB Holder
  • Screw Drivers
  • Tweezers

If you want to know more about these tools, you can check out our product E-catalog, if you want to order our tools, you can contact us:

PRE-SALES
Skype : rewatech
Email : sales@rewatechnology.com

AFTER-SALES
Skype : support-rewatech
Email : support@rewatechnology.com

And there are some other repair guides:

REWA also provide video tutorials for all visitors, you can learn our repair technology from the video.

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6 Comments
  • Jorge Juan
    11/20/2017 at 3:48 pm

    Hello. What happened if NAND is not reprogrammed? Will the phone works?

    Thanks

    • REWA
      12/16/2017 at 6:56 pm

      The phone can not be restored or activated.

  • Ahmed
    05/11/2017 at 11:15 pm

    Hello Rewa team,

    I saw this video on Youtube, and I couldn’t help it not to approach you with appreciation for such an excellent guide.
    I have similar case of an iPhone 5s that was water damaged and now it’s stuck on apple logo blue screen loop of reboots. It has been sent to multiple repair shops for data recovery, but no luck, so memory chip off I believe might be the only hope.

    Do you think you can help with this? Let me know how I can contact you for this.

    Thanks in advance

    • rewaadmin
      05/12/2017 at 8:20 pm

      Thanks for the trust, but so sorry that we do not offer individual service.

  • 02/27/2017 at 12:13 pm

    realy usefull.technology sharing good way. my oppenion make good prodect rewa company .can sale .nice and good

    • rewaadmin
      03/11/2017 at 2:30 pm

      Thanks a lot for the comment. We will keep improving.

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