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How to Upgrade E3 Firmware via SD Card

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:

While we generally recommend customers to upgrade or reload their firmware using the web, you can also use the SD card method to upgrade the firmware for your E3 miner.

IMPORTANT: The SD card upgrade method is specifically suitable for the E3 miner. Do not attempt to use this method on other miners as it could potentially damage them.

Here are the items you’ll need to prepare:

  1. A micro-SD card (recommended capacity: 4 GB or 8 GB). Larger capacity micro-SD cards are not recommended as they may be more prone to errors.
  2. A PC with a Windows operating system (XP or later) and a card reader that supports micro-SD cards.
  3. E3 firmware. You can download the firmware here.

Choose the firmware file named “E3-SD-20180806-pool.zip” as shown below:

  1. Remove the control board from the miner. For instructions on how to disassemble the miner, refer to this guide: How to disassemble miner.
  2. Shift the JP4 jumper to the right on the control board as depicted in the figure below:
  3. Format the micro-SD card to FAT32 using your PC.
  4. Unzip the downloaded firmware and copy its contents to the micro-SD card.
  5. Remove the card from your PC and insert the micro-SD card into the SD card slot on the control board.
  6. Power on the control board with the PSU. At this point, don’t put the control board back into the miner or connect any hash boards to the control board.Allow at least 90 seconds for the files to load automatically. When the files have loaded, the red and green indicator lights on the control board will start to blink.
  7. Power off the control board and shift the JP4 jumper back to its original position (to the left). Remove the micro-SD card.
  8. Reinstall the control board into the miner and run the miner as you normally would.

If you encounter difficulties (e.g., the miner won’t power on because the firmware didn’t load properly onto the control board, or the firmware is still the old version), try repeating the process a few more times.

If you’re still having problems, please contact us for further assistance.

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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.