Straight answers
Firmware install, control boards, dev fee, recovery - the practical answers, kept accurate.
Bitmain signature lock explained (March 2024+)Why Bitmain firmware from March 2024 blocks third-party firmware, and how the toolkit flow installs anyway.VNISH dev fee: what 1.8-2.8% actually pays forThe developer fee is always visible in the dashboard and funds firmware development, support and the ecosystem.How to return an Antminer to stock Bitmain firmwareRollback is built into the firmware and takes about a minute; here is the exact path.How to identify your Antminer control board (AML, XIL, CV, BB)The firmware file differs per control board; here is how to tell Amlogic, Xilinx, CVITEK and BeagleBone apart.Install Toolkit guide: flashing firmware over the networkStep-by-step use of the Install Toolkit to flash one or many Antminers to NAND.Fixing the ssh error during firmware installAn ssh error on 2024+ stock firmware is expected; here is the reliable fix.Amlogic USB unlock (September 2025+ stock)Amlogic A113D boards from September 2025 lock the USB port; this is why and what to do.Presets and J/TH: how efficiency actually raises marginUndervolting cuts watts faster than hashrate, so the power bill drops more than output - that is the margin.Antminer S21 Pro with VNISH: efficiency and overclockWhat the S21 Pro does on stock vs VNISH efficiency and maximum presets.Why every ROIASIC firmware file has a published SHA-256Verify the exact bytes you download match the mirror before you flash.