Braiins OS+ for Antminer
Braiins OS+ firmware downloads for Antminer miners. Open-source autotuning firmware with Stratum V2 support and advanced fleet management.
Overview
Braiins OS+ is an open-source mining firmware developed by Braiins (formerly Slush Pool team). It features autotuning, Stratum V2 protocol support, and fleet management capabilities. The base Braiins OS is free and open-source; Braiins OS+ adds autotuning with a performance-based fee.
Pricing Model: Braiins OS (base) is free. Braiins OS+ (with autotuning) charges a small percentage of hashrate as a dev fee, only applied when autotuning is active. No upfront license cost.
Key Features
| Feature | Stock | Braiins OS | Braiins OS+ |
|---|---|---|---|
| Open source | No | Yes | Partially |
| Autotuning | No | No | Yes |
| Stratum V2 | No | Yes | Yes |
| Power target | No | Manual | Automatic |
| Fleet management | No | BOS Toolbox | BOS Toolbox |
| SSH access | Limited | Full | Full |
| API | Basic | Full | Full |
| Dev fee | None | None | ~2% hashrate |
Supported Models & Versions
S21 Series
Braiins OS+ — Antminer S21
v24.11Autotuning firmware with Stratum V2. Optimize for power target or hashrate target.
S19 Series
Braiins OS+ — Antminer S19 Series
v24.11Full autotuning support with fleet management integration.
S17 Series
Braiins OS+ — Antminer S17 Series
v24.09Stabilized firmware for S17 models with thermal protection.
S9 Series
Braiins OS+ — Antminer S9
v24.06Extended S9 support with autotuning for maximum efficiency.
Installation Methods
Braiins provides multiple installation methods through the BOS Toolbox:
Method 1: BOS Toolbox (Recommended)
BOS Toolbox is a cross-platform fleet management tool that handles installation, updates, and monitoring.
# Download BOS Toolbox
# Available at https://braiins.com/os/plus
# Install on a single miner
./bos-toolbox install <miner-ip>
# Install on multiple miners (from CSV)
./bos-toolbox install --batch miners.csv
# Update existing Braiins OS installations
./bos-toolbox update <miner-ip>Method 2: Web Interface
- Download the firmware image for your model
- Access the miner's web interface
- Go to System → Firmware Upgrade
- Upload the Braiins OS+
.tar.gzfile - Wait for installation to complete (5-10 minutes)
Method 3: SD Card
- Download the SD card image
- Flash to a microSD card using Balena Etcher or
dd - Insert into the miner and power on
- The miner boots from SD (NAND remains untouched)
SD card boot is non-destructive — the original firmware on NAND is preserved. Remove the SD card and reboot to return to the previous firmware instantly.
Autotuning Configuration
Braiins OS+ autotuning works with two modes:
Power Target Mode
Set a target power consumption (watts). The autotuner optimizes chip frequencies to maximize hashrate at that power level.
Hashrate Target Mode
Set a target hashrate (TH/s). The autotuner finds the optimal voltage and frequency to reach that hashrate with minimum power.
# /etc/bosminer.toml example
[autotuning]
enabled = true
psu_power_limit = 3200 # Watts
[temp_control]
target_temp = 75.0 # Celsius
hot_temp = 85.0
dangerous_temp = 95.0Stratum V2
Braiins OS+ is the first firmware to support Stratum V2, the next-generation mining protocol:
- Encrypted connections — prevents hashrate hijacking
- Reduced bandwidth — up to 95% less data vs. Stratum V1
- Job negotiation — miners can construct their own block templates
- Binary protocol — more efficient than JSON-based V1
Fleet Management
BOS Toolbox provides fleet-wide operations:
- Batch install/update across hundreds of miners
- Monitoring dashboard with per-miner metrics
- Configuration templates for consistent fleet settings
- Automatic firmware updates with scheduled rollouts
- CSV/API integration for automation
Reverting to Stock
# Using BOS Toolbox
./bos-toolbox uninstall <miner-ip>
# Or via web interface: System → Factory Reset
# Or SD card recovery with stock firmwarePerformance Comparison
| Model | Stock (J/TH) | Braiins OS+ (J/TH) | Improvement |
|---|---|---|---|
| S21 | 17.5 | 15.0-16.5 | 6-14% |
| S19 XP | 21.5 | 18.5-20.0 | 7-14% |
| S19j Pro | 29.5 | 25.0-27.5 | 7-15% |
| S19 Pro | 29.5 | 25.5-28.0 | 5-14% |
| S9 | 98.0 | 85.0-92.0 | 6-13% |
Official Resources
- Braiins Website: braiins.com
- Documentation: docs.braiins.com
- BOS Toolbox: braiins.com/os/plus
- GitHub: github.com/braiins
- Support: Braiins Support Portal
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