As i said:
You can't mine bitcoin with any off the shelf components or computers.
You need specialized equipment that's made by Bitmain, Canaan, or eBit.
You can't profitably mine Bitcoin directly with a Pi, or a GPU, or a Xeon, or Cray supercomputer.
i agree. you can't get so much from raspberry pi. you're just wasting your time and energy running that itty-bitty gadget.