Unbrick / Repair Dead Samsung android Phones
Your Samsung android phone is dead due to some mistake 
and you are shouting on us & developers , but please wait a sec before throwing your phone to customer care
although we are not responsible for your device damages but we can help at least. Good news is as always we have a solution 
Method 1.
- Switch off your phone
- Reboot in recovery ( Middle key + Power on )
- and select wipe cache
- then select wipe data/factory reset
- Try to boot in download mode , and flash firmware using Odin
Method 2.
***in case if you are unable to boot in download mode then
Try Volume Down + Volume Up + Power on to boot in download mode
Or
- Remove battery
- and press volume up + volume down +power on
- now without releasing buttons insert battery
- Once you are in download mode you can flash firmware using Odin