オリジナル投稿者： uBreakIt iRepairIt ,
I spent some hours researching this issue and came across this video after trying to update the phone via restore mode and received an error 26. Turns out that this video explains the issue very well. https://www.youtube.com/watch?v=WUmY6TVSbcE The video is very lengthy, but @12:30, the lady explains that using an iPhone with a bad battery; up until the point that the phone will no longer take charge, will cause data corruption. This is why the phone would not power on complete and was stuck in a boot loop. It was only up until I did a complete factory reset (last resort for me), that the phone restored and worked.