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| How To Fix iPhone X That Is Bootlooping Error 4013 | |
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| Device | |
| Affects part(s) | |
| Needs equipment | |
| Difficulty | |
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Problem description
How to fix an iPhone X that is bootlooping and gives error 4013 on iTunes. This will cause the Apple logo for flash on and off. Sometimes it will flash green for a second. You will get error 4013 on iTunes or 3u tools.
Symptoms
- Shows apple logo for about 5 seconds, then blank, then apple logo, then blank
- Apple logo on and off, non-stop
- Sometimes it shows a green flash for a second
- If you try to flash an update or restore, it fails right away with an Error 4013
- If you flash on 3u tools, it fails at 19%
Solution
There are 2 common faults:
- Flex Cables:
Step 1 in this case is always unplug all the flex cables.
Ideally test the board with known good Screen, Battery & Charging Port.
If it boots, then one of your flexes is the cause.
99% of the time, it is the ear speaker flex. The Flood Illuminator and/or the ALS has liquid damage.
The ear speaker flex is paired to the logic board for Face ID.
If you want to keep Face ID, you'll need to repair the flex.
If Face ID is not important, then you can just replace the flex.
To repair the flex, you'll have to desolder the component & clean out all the corrosion, then place them back.
If the corrosion is too severe & it damaged the flex, then you'll need to swap the Flood Illuminator and ALS to a new flex, otherwise, you'll lose Face ID.
In some cases, another flex can cause this issue like a bad charging port.
In this case, just replace the flex
2. Sandwich Issue:
In some cases, the bootlooping and Error 4013 is caused by liquid damage on the bottom board.
Underneath the interposer, there are solder balls that connect to the bottom layer.
This solder is leaded high temp solder, so it's not easy to separate.
But you can split the top layer & test with a known good bottom board & see if it boots. If so, then your issue is on the bottom board
Inspect the space between the interposer and bottom layer & check for any signs of corrosion.
In some cases, you can get away with reflowing the area you find the corrosion.
The bubbling of the flux can cause enough friction to clear the corrosion causing bridging between pads.
If this doesn't work, you'll need to do a bottom board swap to get the device working.
Please Note: If the phone is stuck in Recovery Mode because it failed at the Error 4013, you have 2 options
Kick the device out of Recovery Mode using 3U Tools. In the main screen of 3U Tools, you'll see a button that says "Exit Recovery Mode"
You can attempt another update or restore.
Assuming you fixed the root cause of the bootlooping issue, the above 2 options should get you a working phone.
If it still fails at 4013 or still bootloops, then you haven't solve the issue.