ASIC Miner Block Erupter & bfgminer: "no devices found"
Try following the ASIC instructions provided with BFGMiner


  These will autodetect if supported by the device; otherwise, you need to use
  the '--scan-serial erupter:' option to tell BFGMiner what device to
  probe; if you know you have no other serial devices, or only ones that can
  tolerate garbage, you can use '--scan-serial erupter:all' to probe all serial
  ports. They communicate with the Icarus protocol, which has some additional
  options in README.FPGA


Try adding --scan-serial-erupter:all to the command for starting BFGMiner.