I have an iphone 6 that had some fun when cleaning my clothes… battery totally fukked.. (once i opened and checked) I removed it. Then i connected it to wall powersupply.. screen goes on automaticly (white with a black apple logo) then screen goes blueish and while pressing a finger on screen i get like white clouds, same when i press home button.
Then i connect it to my computer (only 2.1v ports worked. usb is normaly 1,5) Itunes find the phone, which type it is and serial number. And it wants to restore it and update it or just update. It fails each time when it starts rebooting the phone and i think it fails because the phone is supposed to use power from battery during that phase.
I have tried clicking homebutton and on/off to enter whatever name it has. Doesnt work.
ps. due to people get their phones destroyed by water (swimming or whatever) they have put a blue paint on the screws which turn red when they come in contact with water.
This due to people taking a bath with their phone in their pocked and they go say it just stopped working. (this makes it easier to see for yourself if and where water has been. (Be carefull, those screws are small, and remember which one is which because they have different lenghts)
Another Ps. If you look att youtube videos they use heater on the front side to loose the battery easier from its battery tape. Do it from the back instead. (But check it up maybe there is something under the metalplate where the battery is located)