Install VNISH on Antminer S21 XP Imm

Amlogic control board (AML). Amlogic A113D chip near the SD slot, AML marking on the sticker

Download firmware

vnish-s21xp-imm-aml-nand-v1.3.4.tar.gz

BUILD 94762 · 20.5 MB · v1.3.4-stable

SHA-256 18f564d925f8cf671a6395279b4d5ed46900ae024d32dac3644228282a7dc7c2

Download firmware Toolkit 1.7.3

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

Amlogic boards with stock from September 2025 also lock the USB port. The USB port must be unlocked first - write to support, we walk you through it

Stock firmware from March 2024 carries Bitmain signature locks. Install only through the toolkit flow (v1.7.1+). If the toolkit reports an ssh error, first update the miner with the newest stock web-update, then retry

Step by step

Download the install file above and check the SHA-256 matches
Install the toolkit on a computer in the same network as the miner
Create a group with your miners' IP range and let it scan; select your miners
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 ⚑
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

Back to stock Antminer S21 XP Imm

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.

ChatGPT Claude Gemini Codex