The largest manufacturer of mining equipment, Bitmain has been criticized for one of its latest products – AntMiner B3.

According to the report from the official company account on WeChat, a new Antminer designed for mining BTM – native token network Bytom, was released on April 25. This happened a day after the team Bytom launched the main network.

The price of the equipment amounted to 17 thousand yuan (or $2600) per unit. The first batch of 25 thousand miners B3 was sold out within a few seconds after the start of the sale.

Technical characteristics of the device States that its computing power is 750 m/s. However, buyers of the first batch of B3 in China claim that Bitmain has considerably overstated this figure.

According to local news resource, the conflict arose after the Chinese miners spent the initial testing of the equipment. The tests showed that the AntMiner B3 can produce only 500-600 H/s instead of 750 H/s. They argue that this difference is critically reduces their calculated profit.

Because the complaints were not isolated, the miners formed a thematic group in the WeChat app and actively expressed their views on the Chinese Q/A website Zhihu.

Social media also rumors that for the production of B3 company uses used components. In addition, the discussion on Zhihu, some users wrote that the fan of a brand-new AntMiner B3 was covered with dust, which may explain the weaker computing power of the device.

Dissatisfied with the quality of the device, users began to demand from the manufacturer a refund.

According to a post on page one of the activists in Weibo on Monday a group of buyers visited the office of Bitmain in Beijing to discuss a solution to this problem. Although the group consisted of less than 10 people, the meeting was attended by a police officer to prevent a brawl.

According to the online edition of Sina, the miners of this group said that Bitmain has expressed readiness to resolve problems with the computing power of the device, but money don’t intend to return.

May 30, another local newspaper reported that after an internal investigation, the company acknowledged problems with individual B3, but noted that such devices comprise only 1% of the entire party. Bitmain also denied allegations that the production miners used pre-owned parts.

“Mining machines are essentially investment products… Profit and cost of token are regulated on the basis of the dynamics of the market, so there’s nothing to guarantee,” said the company.