pls help me,,

this is not my iphone,,1 of my friend,,he gave to me unlock it,,

i did unlock it successfully,,

but i noticed its headphone stucked mode,,so i google it ,,do somethyngs,,like air presseure cleanin,,

worked sometimes but again headphone stuck mode,,

then i again i noticed home button non responsive,,had to press it several time or bit harder,,

so i thought this firmware issue so i tried to restore hmmm looked like its going nice but suddenly it gave me error code 9 and can't restore,,
now iphone is restore mode and itunes dosn't detect and its not last longer and turn it off itself,,
again i turn on apple logo and recover mode appear,,i tunes dosn't detect again iphone turn it off it self,,

tried to get to DFU mode no luck,,keep turn it off while after displaying recovery mode logo,,

wot shoul i doo,,pls help mee,,

pls help meeeeeeeeeeee???:

and i noticed when i connet to usb cable it get unusually hot where home button located area,,