Install VNISH on Antminer S21+ Hydro

CVITEK control board (CV). CVITEK CV1835 chip, CV marking. Typical for L9, T21 and 2024+ boards

Tool for this job

Install Toolkit 1.7.3 (audited by our lab: installs your local ROIASIC file, phones nowhere for firmware) - pick your platform below, SHA-256 published

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 takes about a minute

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.