Table of contents


This document is a quick-start guide on how to install Braiins OS on your mining device. There are two ways how to test and use Braiins OS:

  1. Boot from SD card with Braiins OS image, effectively keeping the stock firmware in the built-in flash memory. In case you encounter any issues, you can simply boot the stock firmware from the internal memory. This is a safe way we suggest to start with.

  2. Permanently reflash the stock firmware, effectively replacing the manufacturer’s firmware completely with Braiins OS. In this method the only way how to go back to the default stock setup is to restore the manufacturer’s firmware from a backup that you create during install.

Due to aforementioned reasons, it is highly recommended to install Braiins OS firmware only on devices with SD card slots.

You will need:

Note: Commands used in this manual are instructional. You might need to adjust file paths and names adequately.

Braiins OS Versioning Scheme

Each release contains a version number that consists of YYYY-MM-DD-P, where:

Field Meaning
YYYY 4 digit release year
MM 2 digit month
DD 2 digit day number
P single digit patch level - in case there was a hot fix re-release on the same day

The version number is also encoded in all artifacts that are available for download.

In addition to the above, each major Braiins OS release has a code name (e.g. wolfram, hafnium, etc.).

Transitional firmwares

The table below outlines correspondence between transitional firmware image archives (as provided at and a particular hardware type.

Firmware prefix Hardware
braiins-os_am1-s9_*.tar.bz2 Antminer S9, S9i, S9j; (R4 support is broken do not USE!!)
braiins-os_dm1-g9_*.tar.bz2 Dragon Mint T1 with G9 control board
braiins-os_dm1-g19_*.tar.bz2 Dragon Mint T1 with G19 control board

Installing Braiins OS for the First Time (Replacing Factory Firmware with Braiins OS)

The steps describe below need to be done only the very first time you are installing Braiins OS on a device. You will be using so called transitional firmware images mentioned above for this purpose.

Initial Steps

Download the latest released transitional firmware images + signatures from:

You can check the downloaded file for its authenticity and integrity. The image signature can be verified by GPG:

gpg2 --search-keys
for i in ./braiins-os_*asc; do gpg2 --verify $i; done

You should see something like:

gpg: assuming signed data in './braiins-os_am1-s9_2018-10-24-0-9e5687a2.tar.bz2'
gpg: Good signature from "Braiins Systems Release Key (Key used for signing software made by Braiins Systems) <>" [ultimate]

Unpack the selected (or all) transitional firmware images using standard file archiver software (e.g. 7-Zip, WinRAR) or the following command (Linux):

for i in  ./braiins-os_*.tar.bz2; do tar xvjf $i; done

Transitional firmware image types

The table below explains the use of individual transitional firmware images

Firmware prefix Hardware
braiins-os_HARDWARE_TYPE_sd_VERSION.img SD card image for testing on hardware, recovering a bricked machine etc.
braiins-os_HARDWARE_TYPE_ssh_VERSION.tar.bz2 transitional firmware for upgrading from factory firmware that has ssh access
braiins-os_HARDWARE_TYPE_telnet_VERSION.tar.bz2 transitional firmware for upgrading from factory firmware that provides telnet access
braiins-os_HARDWARE_TYPE_web_VERSION.{vendor specific extension} transitional firmware for upgrading from factory firmware via the factory firmware web interface. The exact file extension depends on particular hardware type

Phase 1: Creating Bootable SD Card Image (Antminer S9 example)

Insert an empty SD card (with minimum capacity of 32 MB) into your computer and flash the image onto the SD card.

Using software with GUI (Windows, Linux)

Using bash (Linux)

Identify SD cards block device (e.g. by lsblk) and run the following commands (replace VERSION with the current latest release):

sudo dd if=braiins-os_am1-s9_sd_VERSION.img of=/dev/your-sd-card-block-device

Adjusting MAC Address

If you know the MAC address of your device, mount the SD card and adjust the MAC address. in uEnv.txt (most desktop Linux systems have automount capabilities once you reinsert the card into your reader). The uEnv.txt is environment for the bootloader and resides in the first (FAT) partition of the SD card. That way, once the device boots with Braiins OS, it would have the same IP address as it had with the factory firmware.

Booting the Device from SD Card

Phase 2: Permanently Migrating from Factory Firmware to Braiins OS

Once the SD card works, it is very safe to attempt flashing the built-in flash memory as there will always be a way to recover the factory firmware. Follow the steps below. The tool creates a backup of the original firmware in the backup folder. It is important to keep the backup safe to resolve any potential future issues.

Below are commands to replace original factory firmware with Braiins OS using the SSH variant. The tool attempts to login to the machine via SSH, therefore you maybe prompted for a password.

Using Linux

cd braiins-os_am1-s9_ssh_VERSION
virtualenv --python=/usr/bin/python3 .env
source .env/bin/activate
pip install -r ./requirements.txt

python3 your-miner-hostname-or-ip

Using Windows

Please install Python first following this guide. Then proceed to run the following commands consecutively:

cd braiins-os_am1-s9_ssh_VERSION

# create bos environment if it does not exist
mkvirtualenv bos
setprojectdir .

# select bos environment if it has been created already
workon bos

pip install -r requirements.txt

python your-miner-hostname-or-ip

Basic user’s guide

Miner Signalization (LED)

Miner LED signalization depends on its operational mode. There are two modes (recovery and normal) which are signaled by the green and red LED on the front panel. The LED on the control board (inside) always shows heartbeat (flashes at a load average based rate).

Recovery Mode

The recovery mode is signaled by flashing green LED (50 ms on, 950 ms off) on the front panel. The red LED represents access to a NAND disk and flashing during factory reset when data is written to NAND.

Normal Mode

The normal mode state is signaled by the combination of the front panel red and green LED as specified in the table below:

red LED green LED meaning
on off cgminer or cgminer_monitor are not running
slow flashing off hash rate is below 80% of expected hash rate or the miner cannot connect to any pool (all pools are dead)
off very slow flashing (1 sec on, 1 sec off) miner is operational and hash rate above 80 % of expected hash rate
fast flashing N/A LED override requested by user (miner fault_light on)

Identifying a miner in a farm

The local miner utility can also be used to identify a particular device by enabling aggressive blinking of red LED:

$ miner fault_light on

Similarly to disable the LED run:

$ miner fault_light off

AsicBoost support

Braiins OS supports overt (version-rolling) AsicBoost in accordance with BIP310.

Trying to use AsicBoost on pool that is not supporting it will result in error message (device will not start mining at all). Please note there is no automatic detection present at the moment, meaning AsicBoost can be only turned on/off manually.

Antminer S9

AsicBoost is turned on by default. This setting can be changed in:

DragonMint T1

AsicBoost is turned on by default and cannot be turned off. The device is incapable of mining efficiently without AsicBoost.

Migrating from Braiins OS to factory firmware

Restoring the original factory firmware requires issuing the command below. Please, note that the previously created backup needs to be available.

python3 backup/backup-id-date/ your-miner-hostname-or-ip

Recovering Bricked (unbootable) Devices Using SD Card

If anything goes wrong and your device seems unbootable, you can use the previously created SD card image to recover original firmware from the manufacturer:

After the script finishes, wait a few minutes and adjust jumper to boot from NAND (internal memory) afterwards.

Firmware upgrade

Firmware upgrade process uses standard mechanism for installing/upgrading software packages within any OpenWrt based system. Follow the steps below to perform firmware upgrade.

Upgrade via web interface

Upgrade via SSH

# download latest packages from feeds server
$ opkg update
# try to upgrade to the latest firmware
$ opkg install firmware

Since the firmware installation results in reboot, the following output is expected:

root@MINER:~# opkg install firmware
Upgrading firmware on root from 2018-09-22-0-853643de to 2018-09-22-1-8d9b127d...
Running system upgrade...
--2018-09-22 14:23:47--
Resolving,, 2400:cb00:2048:1::6819:6165, ...
Connecting to||:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 10373471 (9.9M) [application/octet-stream]
Saving to: '/tmp/sysupgrade.tar'

/tmp/sysupgrade.tar                     100%[==============================================================================>]   9.89M  10.7MB/s    in 0.9s

2018-09-22 14:23:48 (10.7 MB/s) - '/tmp/sysupgrade.tar' saved [10373471/10373471]

Collected errors:
* opkg_conf_load: Could not lock /var/lock/opkg.lock: Resource temporarily unavailable.
Saving config files...
Connection to closed by remote host.
Connection to closed.

Reset to initial Braiins OS version

Uninstall the current firmware package to downgrade your firmware to the version which was initially installed when replacing the stock firmware.

$ opkg remove firmware

In addition to the above, reset to initial Braiins OS version can also be initiated as follows:

Recovery Mode

Users doesn’t have to typically enter recovery mode while using Braiins OS in a standard way. The downgrade process uses it to restore the original factory firmware from the manufacturer. It can also be useful when repairing/investigating the currently installed system.

The recovery mode can be invoked by different ways: