custom FIRMWARE (no Fee from mining!) for download

Optimizing and Increasing Hashrate for Bitcoin miner S21

The Antminer S21 is a powerful and efficient Bitcoin mining machine that was released by Bitmain in 2023. It is one of the most popular Bitcoin miners on the market and is known for its high hashrate and low power consumption.

Here are some tips on how to optimize and increase hashrate for the Antminer S21:

1. Location Bitcoin miner S21:

  • Place the Antminer S21 in a cool, dry environment with good ventilation.
  • The optimal operating temperature is between 5°C and 40°C (41°F and 104°F).
  • Avoid placing the Antminer S21 in direct sunlight or near heat sources.

2. Power Supply for Bitcoin miner S21:

  • Make sure you are using a high-quality power supply that is capable of delivering enough power for the Antminer S21.
  • A power supply with a capacity of 2400W or higher is recommended.

3. Firmware for Bitcoin miner S21:

  • Make sure you are using the latest version of the firmware for the Antminer S21.
  • Newer versions of the firmware may contain optimizations that can increase hashrate.

4. Settings Bitcoin miner S21:

  • You can adjust the settings of the Antminer S21 to optimize its performance.
  • Some settings you can adjust include the chip frequency, chip voltage, and fan speed.

5. Custom Firmware Bitcoun miner S21:

  • There are many custom firmware available for the Antminer S21 that can increase hashrate by 20-30%.
  • Important: Installing custom firmware may void your warranty.
  • Important: It is important to choose a trusted source of custom firmware.
  • Important: Installing and configuring custom firmware can be technically challenging.

Performance and Power Consumption Table:

Specification Value
Hashrate 200 TH/s
Power consumption 3500W
Power efficiency 17.5J/TH


By following these tips, you can optimize and increase the hashrate for the Antminer S21. Custom firmware can further increase hashrate, but it is important to be aware of the risks and technical requirements.

Additional Resources:

  • Cryptocurrency forums
  • Websites dedicated to cryptocurrency mining
  • Blog posts about Antminer S21 optimization
  • Guides and reviews of specific firmware

Profitable custom mining FIRMWARE S21 for download


Please donate any amount. It is all what you pay for it! This firmware is without any mining fee!

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2) You will receive URL

After donating of any BTC amount you will receive open URL for downloading your Firmware

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3) Download and upgrade

After downloading the Firmware file you can instal it on your miner machine and Enjoy Best firmware ever without mining fee!



Specification of Firmware

for Bitcoin miner S21

  • Custom Firmware for: Antminer S21 (all versions)
  • Version 1.3 - 2024-01-05!! (BigMiner Firmware without Fee from Mining!)
  • Efficiency: 20-35% (Better then Blissz firmware! Better then
  • UnOfficial Bitmain Firmware for Bitcoin miner S21 noFee (From BigMiner)
  • Recommended, at your current firmware, set the miner frequency at 400mhz and set your fan speed manual at 25% before flashing.
  • Download the custom firmware. (dont unpack it)
  • Flash by going to "System" -> "Upgrade" -> "Flash new firmware image" and select the custom firmware.
  • After flashing, check the advanced settings page and start at the lowest voltage setting and 400mhz. From there increase your frequency to see how high you can go at the lowest voltage setting.
  • Start tweaking some more. See the profile suggestions below.


In case of any problems you can write to