Higher hashrate
Configurable frequency and voltage controls can change hashrate. Results depend on the individual miner, power and cooling.
hub • package information • compatibility guides
VNISH Firmware for Antminer ASIC Miners
The professional custom firmware and VNISH Online Updater (VOU) for Bitmain Antminer S19, S21, T21, L7 and L9. Per-chip autotune, ASICBoost, immersion mode, fleet management and one-click rollback — free download.
Per-chip
Autotune controls
Flexible
Power targets
1-Click
Rollback
Free download
Developer fee: verify for your build
Version details published
Compatibility notes included
VNISH Online Updater
Install, monitor, and manage miner groups
One-click firmware installation
Real-time fleet monitoring
Mass settings cloning
Direct VOU downloads
Model-led
Compatibility checks
3
VOU packages
18
Localized pages
VOU archive
Why miners choose VNISH
VNISH offers alternative tuning and fleet-management controls for supported Antminers. Compatibility, recovery options and measured performance depend on the model, control board and firmware build.
Lower J/TH
Low-Power Mode and per-chip undervolting provide adjustable power targets. Measure watts at the wall and monitor stability.
Fleet at scale
VOU deploys firmware, clones settings and monitors grouped devices from one dashboard.
Operational safeguards
Use restricted management networks, strong credentials, verified files, staged rollouts and a tested recovery path.
Custom ASIC Firmware Features
Optimize your mining hardware
Controls for tuning, power targets and fleet operations, with results that vary by hardware and environment.
Per-chip Autotune
Analyses each ASIC chip and adjusts voltage and frequency individually. Pushes healthier chips and protects weaker ones for the best stable J/TH.
ASICBoost & Low-Level Tuning
Tuning controls can change performance, but no fixed uplift applies across every miner or profile.
Low Power Mode (LPM)
Set lower power targets with frequency and voltage controls, then validate wall power, temperatures, errors and uptime.
Per-chip Throttling
Per-chip throttling for the x21 series adjusts cooler and hotter chips separately to keep hashrate stable under thermal pressure.
Immersion & Hydro
Dedicated immersion mode disables fan checks for submerged miners; hydro models get inlet/outlet water-temperature widgets and tailored presets.
Mass Install & Cloning
Push firmware and matching settings to grouped miners on the same network with progress tracking.
Auto-scheduling
Switch presets by time-of-day to mine harder during off-peak electricity hours and dial back power during peak rates.
Malware Protection
Detects and removes ANTBUILD, NIGHT SWITCHER and other ASIC malware that hijack hashrate to attacker pools.
One-click Rollback
Some supported paths can return a miner to stock firmware by updater or SD recovery. Restoring stock does not guarantee warranty eligibility.
Open API + Telegram
Pull metrics into your own dashboards or get instant Telegram alerts on hashboard errors, overheats and pool failures.
Hardened Security
Brute-force protection on the web UI, SSH controls, EEPROM corruption fixes and chain-error auto-shutdown for non-PIC models.
Smart Fan Control
Auto fan curves with safe fail-states, max-speed caps in auto mode, and customisable thresholds for noise-sensitive deployments.
Built for serious mining operations
From a single home miner to larger industrial fleets, VNISH is built for day-to-day S19, S21, L7 and L9 workflows.
Measure your own performance
There is no responsible universal hashrate or power-saving figure. Compare one miner against its own stable baseline before changing a fleet.
1. Baseline
Record wall power, accepted hashrate, reject rate, temperatures, fan speed and errors on the current build.
2. One change
Keep pool, PSU, cooling and ambient conditions comparable. Change one profile at a time.
3. Stabilise
Allow tuning to settle and use a meaningful observation window, not a single dashboard snapshot.
4. Decide
Compare efficiency, errors and uptime as well as hashrate. Stop if power, heat or instability exceeds your limits.
Download VOU (VNISH Online Updater)
Choose the VOU package for your platform. Windows, macOS and Android files are hosted on this domain so you can download and verify them from one place.
Verify these downloads against before running them.
Discovery: Scan LAN ranges and find supported Antminer devices.
Bulk install: Push VNISH firmware to compatible miners in batches.
Rollback: Keep recovery files ready before production flashing.
Supported Antminer models
Firmware support is specific to the exact miner model, control board and cooling design. Catalog pages reviewed 4 September 2026 list version 1.3.5 for many supported S21, T21, L7 and L9 variants, while other combinations may retain older builds. Verify your hardware in the current VNISH catalog and S21/T21 compatibility notes before use.
BTC
S19 Series (air)
- S19, S19 (88), S19 (126), S19+, S19A, S19A Pro
- S19i, S19j, S19j+, S19j Pro, S19j Pro+, S19j Pro A
- S19k Pro, S19 Pro, S19 Pro A
- S19 XP, S19 XP+, S19j XP
BTC
S19 Hydro / Immersion
- S19 Hydro
- S19 Pro Hydro, S19 Pro Hydro 120, S19 Pro+ Hydro
- S19 XP Hydro, S19 XP+ Hydro, S19j XP Hydro
- S19E XP Hydro
BTC
S21 Series (air)
- S21, S21+
- S21 Pro, S21 XP
- U3S21EXPH (XP Hashboard)
BTC
S21 Hydro / Immersion
- S21 Hydro, S21+ Hydro
- S21 Imm, S21 Immersion
- S21 XP Hydro, S21 XP Imm, S21E Hydro
BTC
T19 / T21 Series
- T19, T19 Hydro, T19 Pro Hydro
- T21, T21 Xilinx
LTC / DOGE
Scrypt (L-Series)
- Antminer L7 (all sub-models 8050M–9500M)
- Antminer L9
Control board types: XIL, AML, CV, BB
Always pick the firmware build that matches your specific control board. XIL = Xilinx, AML = Amlogic, CV = Cvitek, BB = BeagleBone. Mismatched firmware will not boot. The factory sticker or VOU device probe shows your board type.
Firmware downloads by model
Which control board types are supported?
VNISH supports Xilinx (XIL), Amlogic (AML), Cvitek (CV) and BeagleBone (BB) control boards. Always pick the firmware build that matches your board — VOU's device probe will tell you.
How do I install on a brand-new Antminer?
Record the full stock build and identify the Amlogic control-board revision. Check current model-specific instructions instead of relying on a universal date range, and prepare the correct recovery image before a NAND change.
Can VNISH automate based on electricity prices?
Yes. The auto-scheduler switches presets by time of day — mine in LPM during peak electricity hours, switch to overclock during off-peak hours. Fully configurable in the dashboard.
Warranty notice
Custom firmware may affect manufacturer or seller warranty. Review the applicable terms before installation; restoring stock does not guarantee warranty eligibility.
Tune conservatively
Aggressive overclocks need adequate cooling and a quality PSU. Start with a default preset, validate stability for 24h, then push voltage/frequency.
Verify integrity
Always verify the package name and size for VOU packages and any release package information supplied with firmware downloads. Only flash files matched to your exact model and control board.
About VNISH
vnish-software.com is an independent reference and VOU download hub. It is not presented as Bitmain or the VNISH development team. Verify current product claims, compatibility and release details against primary documentation before changing production miners.
S19 / S21
Antminer BTC series
Air, hydro and immersion variants
L7 / L9
Antminer LTC / DOGE
Scrypt miner support
3–4 h
Typical autotune
Per-chip optimisation window
Before installing firmware
Match the instructions to the exact miner and installed firmware before selecting a package. Work through these checks in order:
- Identify the Antminer control board and record the miner model.
- Read the stock firmware compatibility guide; a matching series name is not enough to establish compatibility.
- Check the release and changelog guidance for the build you intend to use.
- Review download and management security and preserve the original settings.
- If installation fails, follow the support checklist before retrying or attempting recovery.