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my iPhone 5s ’s LED Flash and buttons not working except home button that works fine the problem happens after my phone’s fall is it a hardware or software problem and how to resolve it

Well if you’re a tech and know how to open up your phone you can do that As you mentioned that only home button is working you probably can’t do hard reset(home + lock button) You can try to disconnect the battery and re-attach it after a few sec to see maybe this will bring back your buttons Otherwise you might try to change flex cable where all the buttons and a flash are located There should be a guide on this website if you never had done it, but if you’re not a tech i would leave it for someone else as it’s not the easiest task!