IPhone XS Bootlooping, Fails Update with Error 4013

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IPhone XS Bootlooping, Fails Update with Error 4013
Device
Affects part(s)
Needs equipment
Difficulty
Type

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Symptoms

• Shows apple logo for about 5 seconds, then blank, then apple logo, then blank
• 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

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

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

1. 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"
2. 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.

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