ROI ASIC - The exact VNISH firmware for your Antminer

Why it pays

In 2026 the winner is whoever mines cheaper

Block rewards shrink, power prices climb, and replacing your fleet means new capital outlay and new risk. The cheapest extra output is raising the performance of the hardware you already own: fine tuning cuts the energy spent per terahash (that J/TH figure), and factory settings leave that money on the table every day.

Firmware Finder

Type your model. Get the exact build

Firmware Cockpit

source verified · official versions only

Model

Control board

Method

BUILD --v1.3.4-stable · reversible

SHA-256-

Download build Install guide

The file is half the job: installing takes the toolkit and five steps. Hit Install guide - the assistant builds the full kit for this model

Full install guide →

Why VNISH

Six reasons serious miners switch

Performance

Up to 20% more hashrate

Per-chip auto-tuning unlocks the performance your hardware already has.

Economics

Fewer watts per terahash

Efficiency profiles cut watts per terahash and extend hardware life.

Thermal

Smart temperature control

Auto-switching presets protect your miners through heat waves and winters.

Fleet

One-click mass deployment

Install and clone settings across unlimited miners in one network.

Integration

Full API access

Automate, monitor and integrate with your own stack via complete APIs.

Visibility

Real-time mining intelligence

Track every metric live and fine-tune profit as conditions change.

Self installation

No tech skills? Three steps, 15 minutes

Find your build

Type your model in the Finder. You get the exact verified file for your control board.

Install over the network

Run the toolkit: remote NAND install in about 15 minutes. No SD card, no physical access for most boards.

Watch your miner's performance grow

Open the dashboard and pick from a whole range of presets - from quiet eco to overdrive. The effect shows immediately; rollback anytime.

Proven on current-gen

Same S21. Sharper economics

Stock factory VNISH · Efficiency VNISH · Max output

Hashrate

224 TH

Power

2934 W

J/TH

13.1

Effect

+14% margin

Same machine, 16% less power for 4% less hashrate: energy per terahash drops from 15.0 to 13.1 joules. At $0.08/kWh that lifts daily margin by roughly 14%.

Antminer S21 Pro · Numbers are estimates, not guarantees.

Inside the firmware

The dashboard you actually run

Hashrate, thermal bands, pools, fans and per-board health. This is the interface behind every build on this page.

ROI ASICVNISH GLOBAL

Monitoring

▦ Dashboard

Settings

⛏ Mining

⚙ System

🛟 Tech. support

⇪ Firmware update

Hashrate

233.12

Current: 234.06 · TH/s

Temperature

38° - 64°

Board: 23° - 49° · °C

Power

4318

Estimated data · Wh

Errors

0 H/s

Performance ⚡ tuned

4300 watt ~ 233 TH

Efficiency: 18.5 J/TH · Autoswitch: disabled

Hashrate 1h · 12h · 24h

10:00 · 12:00 · 14:00 · 16:00 · 18:00

Temperature 1h · 12h · 24h

16:00 · 20:00 · 00:00 · 04:00 · 08:00 · 12:00

Pools

btc.vnishpool.com:3333524K diff195 accActive: 16ms btc.vnishpool.com:443131K diff0 accAlive btc.vnishpool.com:25- diff0 accOffline

Fans Mode: Auto · Fan duty: 72%

Fan 17590 RPM ✻

Fan 28000 RPM ✻

Fan 38000 RPM ✻

Fan 47710 RPM ✻

Board 1 ↗

77.64 TH/sHR (99.72%)0.00 H/sErrors38-64 °CTemp678.23 MHzFreq15.03 VVoltage108chips good

Board 2 ↗

77.91 TH/sHR (100.04%)0.00 H/sErrors40-63 °CTemp684.02 MHzFreq15.03 VVoltage108chips good

Board 3 ↗

77.57 TH/sHR (98.42%)0.00 H/sErrors39-64 °CTemp681.87 MHzFreq15.03 VVoltage108chips good

⌨ LogsAntminer T21v1.3.4

ROI Lab

Estimate your margin on real numbers

Your operation

Fleet size50

Electricity$0.06 / kWh

Hashprice$0.055 / TH / day

Machine-

Fewer watts at almost the same hashrate: the power bill drops faster than output - that is where the extra margin comes from

Numbers are estimates, not guarantees.

12-month projection

Stock / day

VNISH / day

Extra margin / year

Informational only. Not tax, legal or financial advice.

Who we are

ROI ASIC is the official distribution of VNISH firmware - the most widely used custom ASIC firmware on the planet. One product, done properly: real builds, real support, real economics

300+

global partners

Antminer models supported

languages of support

2017

firmware heritage since

Distribute your own branded firmware

For mining hotels, colocation providers and large fleets: your logo, your personal fee proxied to any pool, our full technical support. Every hosted ASIC becomes your recurring revenue stream.

24/7 support for setup, updates and full miner configuration

Exclusive terms for high-volume and enterprise miners

Become a partner

FAQ

Straight answers

Yes. The build is free to download and run. A developer fee of 1.8-2.8% of hashrate applies and is always visible in the dashboard - never hidden. The fee funds what keeps the product alive: new releases for new models, round-the-clock technical support and the ecosystem the team has been building since 2017.

Yes. Every build is reversible: a built-in rollback returns the miner to stock Bitmain firmware in about a minute. Note: whether the manufacturer's warranty covers third-party firmware is decided by Bitmain and your vendor - check your terms before installing.

45 models across the S21, T21, S19, L7 and L9 series, including Hydro and Immersion versions, on Amlogic, BeagleBone, Xilinx and CVITEK control boards.

About 15 minutes remotely over the network (NAND install via toolkit). No SD card or physical access is required for most boards.

ROI Lab models payback and margin per site and keeps clean, exportable records for your accountant.

Your Antminercan do more.Our firmware unlocks it

Install Assistant