Unhappy [Q] Help need, I can't enter download mode

I tried to use overstock firmware(I forgot the version) with odin, but it failed to upload firmware and the phone never boot further, only shows "Overstock smaller, lighter, Faster" and stopped.
I tried to enter download mode, but I can't proceed anymore. I pressed " volume up/down+ power " key but the screen stuck and never go further.

I'm not a fluent English speaker.
please help me.