Install VNISH on Antminer U3S21EXPH

Xilinx control board (XIL). Xilinx Zynq chip in the board center, XIL marking. The most common board on S19

Tool for this job

Install Toolkit 1.7.3 (installs your local VNISH NINJA file, phones nowhere for firmware) - pick your platform below, SHA-256 published

Write to support →

Step by step

1. Download the install file above and check the SHA-256 matches
2. Install the toolkit on a computer in the same network as the miner
3. Create a group with your miners' IP range and let it scan; select your miners
4. Choose Install firmware, point to the folder with the downloaded file and confirm - the toolkit's name and version fields can stay at defaults. Do not cut power while flashing ⚑
5. Open the miner web UI: set your pools, pick a preset, watch the first hour

⚑ owner confirmation required - do not run unattended

After the install

• Set your own pools and worker names
• Start with the efficiency preset for the first 24 hours
• Watch temperatures and hashrate for the first day
• Keep the downloaded file - batch installs reuse it
• Test on 2-5 miners first, then write to us for individual terms on the fleet

Back to stock

Safety net: rollback to stock Bitmain firmware is built in and typically takes a few minutes including reboot. Custom presets and settings do not carry over - note your pools and workers first. Unusual board revision? Contact support to verify this hardware revision before flashing

Install with your AI assistant

Hand this exact kit to your assistant - it guides you; you install locally and confirm. Read-only, never remote flashing.