Now problem is not to get a 6.7Gh as describe but Zigminer can be use this miner to hash another algorythm ? to make a way to your customer to make a profit.
I warn you, any manufacturer of asic. If u produce a asic and sell them in high price and didn't give any customer to make a profit. Customer will not buy it again. Just make a customer to get some profits.
first learn what an ASIC is. then complain.