Whatsminer has just released a new flash that will increase the miners speeds by 1-2 THash. Note: You must first identify which controller board you are running so you can load the correct firmware. There are 2 controller boards that have shipped, the H3 and the H6. The controller type can be found using the whatsminer tool (also available to download from same link) or miner web interface–>overview menu.
The flash can be downloaded from HERE.