Would be interested in the sgminer.bin once someone gets one of the BK-G28s.
you want downgrade x10? from the share photos, it's obvious the asic chip wont be same as x10.
on the miner page which shows 96 chip on board, total 7 hash board (14 pcie power), running clock 300MHz, Hashrate 4.055 (per board) on x11
x10: 3.33 / 64 = 0.0521 hashrate per asic chip
G28: 4 / 96 = 0.0417 hashrate per asic chip