What is VNISH firmware?

VNISH is a closed-source custom firmware for Bitmain Antminer ASIC miners that replaces the stock Bitmain firmware to provide per-chip tuning, overclocking, low-power mode, ASICBoost, immersion support, mass deployment, and fleet management.

Is vnish-software.com an official VNISH website?

No. vnish-software.com is an independent VNISH reference and download hub. VOU download buttons point to files hosted on this domain. Always verify checksums before flashing firmware.

Is VNISH firmware free?

Yes. VNISH firmware and VOU are free to download and use. The firmware uses a built-in 1.8-2.8% dev fee on hashrate.

What is the VNISH dev fee?

The VNISH dev fee ranges from 1.8% to 2.8% depending on agreement and tuning configuration; this is comparable to or lower than competing custom firmwares.

Which Antminer models does VNISH support?

VNISH 1.2.7-stable supports Antminer S19, S19 Pro, S19j, S19j Pro, S19k Pro, S19 XP, S19 XP+, S19 Hydro, S21, S21+, S21 Pro, S21 XP, S21 Hydro, S21 Immersion, T19, T19 Hydro, T21, L7, L9, U3S19XPH and U3S21EXPH.

How much hashrate boost can VNISH deliver?

VNISH typically delivers 15-30% hashrate gains versus stock firmware on supported models, with reports of up to 43% on aggressive overclock profiles for S19j Pro.

How much can VNISH reduce power consumption?

Using Low Power Mode (LPM) and per-chip undervolting, VNISH can reduce power consumption by 10-25% while maintaining or even increasing efficiency in J/TH.

How long does VNISH autotune take?

Autotune typically completes in 3-4 hours, depending on miner model, ambient temperature, and chip variability. The process tunes voltage and frequency per chip for the best stable J/TH.

Can I rollback to stock Bitmain firmware?

Yes. VNISH includes a one-click rollback path on supported models. You can also flash the official Bitmain recovery image via SD card if needed.

Does VNISH void Bitmain warranty?

Installing custom firmware may void the manufacturer warranty. Review your Bitmain warranty terms before installing VNISH.

How do I verify VNISH firmware integrity?

For VOU packages hosted here, compare the SHA256 hash in /checksums.txt with the downloaded file. For firmware images, use the checksum published with that specific release before flashing.

What is VNISH Online Updater (VOU)?

VOU is a VNISH fleet-management tool; this site provides VOU downloads hosted on this domain. It scans the network, deploys firmware, applies settings, monitors hashrate and helps automate miner groups.

Does VNISH support immersion cooling?

Yes. VNISH includes a dedicated immersion mode that ignores fan checks for submerged miners, supports hydro models, and exposes water-temperature monitoring on supported S19 Pro Hydro variants.

What is per-chip autotune?

Per-chip autotune analyses the silicon quality of each individual ASIC chip and applies the optimal voltage and frequency, pushing healthier chips harder and dialling back weaker ones for the best overall efficiency.

ASICBoost is an optimisation technique for SHA-256 mining that reduces the work needed for each hash. VNISH supports ASICBoost-style optimisations on compatible Antminer hardware to boost efficiency.

Can VNISH manage fleet rollouts?

Yes. VOU supports bulk firmware install, settings cloning, network discovery, scheduled rollouts and centralised monitoring for grouped miners.

Is VNISH safe to install?

VNISH has been used in production environments since 2016. Built-in safeguards include automatic shutdowns on overheating, brute-force web protection and rollback, but installing custom firmware is at the operator's risk.

Which VNISH workflow should I choose?

Choose the workflow by miner model, control board type, stock firmware date and whether you need SD recovery, NAND install, VOU update or the VOU workflow deployment.

How do I install VNISH on a brand new Antminer?

Check the stock firmware date, download the correct recovery image if needed, flash with Balena Etcher to FAT32 SD card, boot the miner once, then use VOU to install the final VNISH firmware to NAND.

Independent hub • checksums • v1.2.7-stable

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.

+15–30%

Hashrate boost

−25%

Power use (LPM)

1-Click

Rollback

Download VOU Browse Firmware

Free download

1.8–2.8% dev fee

SHA256 verified

Checksums included

VNISH Online Updater

Install, monitor, and manage miner groups

One-click firmware installation

Real-time fleet monitoring

Mass settings cloning

Direct VOU downloads

40+

Supported model SKUs

VOU packages

Localized pages

SHA256

VOU archive

Why miners choose VNISH

VNISH replaces the conservative one-size-fits-all stock Bitmain firmware with a precision tuning engine, real fleet tools and a clear safety net.

Higher hashrate

15–30% more TH/s on supported S19/S21 models thanks to optimised low-level instructions and ASICBoost-style optimisations.

Lower J/TH

Low-Power Mode (LPM) and per-chip undervolting deliver up to 25% energy savings, ideal for high electricity rates and home miners.

Fleet at scale

VOU deploys firmware, clones settings and monitors grouped devices from one dashboard.

Production-grade safety

Brute-force protection, ANTBUILD/NIGHT SWITCHER malware cleanup, EEPROM safeguards and one-click rollback to stock.

Custom ASIC Firmware Features

Optimize your mining hardware

Everything you need to push more hashrate, cut power and keep the fleet stable — built into one firmware.

Per-chip Autotune

Analyses each ASIC chip and applies the optimal voltage and frequency individually. Pushes healthier chips and protects weaker ones for the best stable J/TH.

ASICBoost & Low-Level Tuning

Optimised SHA-256 work paths and tightened low-level instructions deliver double-digit hashrate gains versus stock Bitmain firmware.

Low Power Mode (LPM)

Drop power up to 25% with dynamic frequency scaling and precise voltage control — perfect for home miners and high-electricity sites.

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

Revert to stock Bitmain firmware in one click or via SD recovery image — warranty-friendly recovery on supported models.

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.

Get VOU now

Performance gains by model

Typical results after VNISH autotune on healthy hardware with adequate cooling. Actual numbers vary by chip lottery, ambient temperature, and PSU.

Model	Stock hashrate	VNISH typical	Stock J/TH	VNISH J/TH	Boost
Antminer S19	95 TH/s	110–115 TH/s	34.5	30–31	+15–20%
Antminer S19 Pro	110 TH/s	130–138 TH/s	29.5	26–27	+18–25%
Antminer S19j Pro	104 TH/s	120–125 TH/s	29.5	27–28	+15–20%
Antminer S19 XP	140 TH/s	160–172 TH/s	21.5	19–20	+15–23%
Antminer S19k Pro	120 TH/s	136–144 TH/s	23	20–21	+13–20%
Antminer S21	200 TH/s	225–240 TH/s	17.5	15.5–16	+12–20%
Antminer S21 Pro	234 TH/s	260–280 TH/s	15	13.5–14	+11–20%
Antminer S21 XP	270 TH/s	300–320 TH/s	13.5	12–12.5	+10–18%
Antminer T21	190 TH/s	205–220 TH/s	19	17–18	+8–15%
Antminer L7 (9050M)	9.05 GH/s	9.6–10.0 GH/s	0.36	0.32–0.34	+6–10%
Antminer L9	16.0 GH/s	17.0–17.6 GH/s	0.34	0.30–0.32	+6–10%

All figures are approximate and depend on individual hardware. VNISH does not guarantee specific results — tune conservatively first.

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 SHA256 checksums before running them.

Windows

Windows 10 / 11

Windows 7z archive

Download VOU

macOS

Apple Silicon / Intel

macOS zip archive

Download VOU

Android

Android APK

Android APK file

Download VOU

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

VNISH 1.2.7-stable supports 40+ Antminer SKUs across BTC and LTC mining, including air, hydro and immersion variants.

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?

Check the stock firmware date. If incompatible (March–Nov 2024 or Sep 2025+ on Amlogic), install Bitmain's recovery SD image first. Then use VOU for a clean NAND install of VNISH and run autotune.

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

Installing custom firmware may void Bitmain warranty. Use one-click rollback or the Bitmain recovery image to restore stock before any RMA.

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 SHA256 checksums for VOU packages and any release hash supplied with firmware downloads. Only flash files matched to your exact model and control board.

About VNISH

VNISH is a custom mining firmware project active since 2016. Built by a team of engineers with deep ASIC experience, VNISH replaces the conservative stock Bitmain firmware with precision tuning, real fleet tools and a clear safety net for both home miners and industrial farms.

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