MY IPHONE 3GS STUCK AND BRICK IN BLACK SCREEN AFTER TRYING DOWNGRADE?

I tried to downgrade my 3GS from 6.1.6 to IOS 4.1 i have the shsh blobs and i tried to do it with ifaaith i did the steps but after i did it on the itunes i got that error and now my iphone is stuck on black screen i tried to restore the ios 6 and ios 4 from itunes but it didn't work please help!

Try the hard reset thingy. Push the home button (bottom) and the power on/off button(top) at the same time and hold it for about 10 seconds. This will reboot the iphone; hopefully, the apple logo will return. If there's any error detected, it will give you an error message. Search for the explanation to the error message.