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How to Reload or Upgrade B3 Firmware

Start with safety and logs

Power down before opening a miner, label cables before moving boards, and capture logs before repeated reboots erase useful evidence. Record model, firmware, pool, uptime, fan speed, temperature, reject rate, chain count, and the exact error text.

Confirm the fault class

Separate configuration faults from hardware faults first. Pool errors, DNS failures, bad worker names, overheating, weak power, fan faults, and missing hashboards can look similar from the dashboard but require different fixes.

Document the test path

Change one variable at a time and keep the before/after result. Note cable swaps, PSU swaps, firmware changes, pool changes, fan replacements, ambient temperature, and whether the fault follows a hashboard, control board, network, or power source.

When to escalate

Escalate to professional repair when there is a burned smell, melted connector, breaker trip, corrosion, repeated hashboard loss, liquid exposure, or a board-level fault that returns after a basic cable, power, firmware, and airflow check.

After the fix

Run the miner long enough to confirm stable accepted hashrate, fan behavior, chip temperature, reject rate, and pool-side reporting. A dashboard that looks normal for five minutes is not enough evidence for a recurring power, heat, or hashboard fault.

· D-Central Technologies · ⏱ 2 min read

Last updated:

Please follow the steps below to upgrade the firmware of your ANTMINER B3:

  1. Download the B3 firmware: Visit our B3 firmware page to download the firmware. You will find two firmware files:
    • ANTMINER-B3-201805232020-750M.tar.gz: This firmware fixes the fan speed display problem.
    • update_1000.tar.gz: This firmware improves the hash rate of the B3 miner.
  2. Upgrade the first firmware (ANTMINER-B3-201805232020-750M.tar.gz): Follow the instructions provided in the ‘How to Reload or Upgrade Firmware’ guide. Ensure not to power off or disrupt the miner during the firmware reloading or upgrading process. The process takes approximately 5 minutes. If it exceeds 10 minutes, abort the process and attempt to update again.
  3. Setup the miner: Once the firmware upgrade is completed, setup your miner as normal, acquire the IP address, and log in to the user interface of the miner.
    • Instructions on how to set up your B3 are available here.
    • If you are facing issues in getting your IP address, refer to these guides:
      • Where and How to Use IP Reporter
      • I have problems getting my IP address
  4. Upgrade the second firmware (update_1000.tar.gz): After successfully logging into the miner’s user interface, proceed to upgrade the second firmware. Similar to the first upgrade, do not power off or disrupt the miner during this process. If the upgrade is successful, you will see a “System Upgrade Success” message.

If you encounter any issues during the upgrade process, or if the ASIC status begins to show “??” indicating that the miner is not working, troubleshoot the problem or create a repair ticket to return the hash board to us for repair. Guides for these processes are provided below:

  • Test hash board one by one
  • How to create a repair ticket
  • Repair guide
  • Repair FAQ

For further inquiries or assistance, feel free to contact us.

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Editorial review and limitations

Reviewed by D-Central's mining hardware and ASIC repair editorial team for practical accuracy, buyer risk, repair context, and operational assumptions. Verify current hardware price, stock, network difficulty, BTC price, power rate, shipping, tax, firmware, and device condition before buying, hosting, repairing, or retiring mining hardware.

Last reviewed May 24, 2026. D-Central, Laval, Quebec.

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Last reviewed May 25, 2026. Added to route educational and product traffic toward exact commercial next steps.