If your Hummer Miner H7 H7 Pro is not working properly, it may be a problem with the control board. If damaged, it is recommended that you immediately replace the damaged control board with a new H7 H7 Proa control board to reduce unnecessary mining losses. We sell Hummer Miner H7 H7 Pro control boards to miners worldwide at a reasonable price and higher quality. All control boards will be strictly tested before shipment to ensure normal operation.