iPhone Bootlooping Troubleshooting Guide. How To Fix a Device That Flashes Apple Logo. PART 1
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Many things can cause an iPhone to bootloop. Bad battery, charging port, front camera flex, etc.
First step would be rule out bad parts by unplugging them or testing the motherboard in a known good housing.
Then you can try an update using 3u Tools (download at www.3u.com) and flash the latest iOS version available. Make sure to select "Retain User Data" if you don't want to risk losing data from the phone.
Retain User Data = The same as an UPDATE on iTunes Quick Flash = The same as a RESTORE on iTunes. This is a factory reset.
Also, make sure to try flashing again by selecting 'iTunes Flash" on the upper left or 3u tools & take note of what error code you may get.
Error 9 - Maybe bad NAND Error 14 - Maybe RAM issue or Storage too full Error 26 - Data corruption & requires a restore/factory reset Error 78 - Data corruption & requires a restore/factory reset Error 4013 - Can be many things. Many times it can be parts issue Error 1100 - Maybe RAM issue Error 1110 - Software corruption & requires special process to recover data. Or restore it to get it working with no data.
Let me know in the comments below what error codes you've seen & how you resolved it.
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