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recently my phone my battery becomes dead on having like 45% or 20% charged and then yesterday when im trying to charge my phone the apple logo appears and then it goes off again tried to look for some solutions on google it says hold home button for 5 sec then the power button at the same time while plugging the wire of the charger with the computer to connect with itunes it has succeed to connect and then whether im clicking on update or restore it says waiting for iphone and the charging logo appears on my iphone, nothing happens and its failed at end, so please tell me what to do.

It’s probably just your battery that needs replaced..after behaving erratically for some time old batteries lose charging power and eventually die. Phone doesn’t start without a working battery, so you’ll need to buy one and DIY or take the phone to any repair shop and get it replaced.