Is your player similar to this:
3.0'' 16:9 16GB Touch Screen MP3 MP4 MP5 Player FM new?
You said you have a 8GB version right? But from the same seller - radio-shop99?
Firstly, you shouldn't need to update the firmware on your player, it should just work fine out of the box. Is it working fine?
So you're looking for instructions for the player? I have a similar player as well, but only a 4GB version. Let me what you need and I'll help you out as much as possible.