a reset phone is locked to an apple id that cant be accessed.

iphone is erased and locked to another app id, i cannot log onto my apple id to sync my music. My friend cannot recover her apple id to remove said phone from her devices. I tried to reset to iPhone to sync it to my apple id ************* and this phone is registered to an apple id account find my phone app. My friend Marina Kelly apple id account**************.com is unable to access her account to remove the phone from her devices. model A1332 emc380B FCC ID:BCG-E2380B IC:579C-E23080B. I had it once and the directions said to wait 90 days however I updated to recent iTunes and now the phone is recognized as malfunctioning by my windows 10 cpu. The usb is unrecognizable to windows 10. ive updated my drivers tried install uninstall usb drives. please help? Ive had an iPhone last summer and enjoyed your products. I would like to continue as a customer.