Bitmain when releasing Antminer L7 failed to provide the claimed performance parameters of 9.5 GH/s on the first devices that came off the assembly line. The manufacturer made a promise to miners, to increase the hash rate and optimize power consumption with stock firmware.
On our site users can find the most current updates for Antminer L7 from Bitmain. The independent work of the ASIC miner manufacturer's engineers to improve the software for the released equipment, so far, keeps independent developers from releasing custom firmware.