Braiins OS / Braiins OS+

Braiins states that its custom firmware lets miners “mine more bitcoin at any power limit, optimize chip performance and increase ASIC lifespan,” and that it is designed for large-scale operations.

Stated features: autotuning that assigns more work to stronger chips; dynamic performance scaling to prevent overheating; native immersion mode without fan spoofers; Stratum V2 support; batch installation and remote configuration through Braiins Toolbox; and a public gRPC-based API.

Hardware: the page says all major Bitmain Antminer models are supported, including S21, S19 and T-series, and older S17/S9 variants. Check your exact model and control board on the official list.

Fees: a dev fee of 2–2.5% depending on hardware model, and zero pool fees when mining on Braiins Pool with Braiins OS, as stated by the vendor.

Whether the firmware is open source is not stated on the page consulted. Read the fee terms and confirm compatibility before flashing.