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Hey my samsung s5 is goes black after I try to downgrade my phone but mistakenly used wrong stock rom then when I againg flash it with right stock rom my goes screen goes black but my phone is working I can hear volune sound and my phone is vibrating I showed it to samsung they say that display is okay but ic is corrupt or software si please tell what should I do show I try again flashing ny phone with 3.0 usb my phone is indian

If you are downgrading firmware from a newer android version to a older one you have to wipe data / factory reset the phone through recovery mode. Otherwise you may be flashing incorrect firmware, only flash firmware that matches the model number in download mode or back of compartment battery sticker label. Should be something like SM-G900 something, match it to the number and letter too.