What is Blissz Firmware?

Blissz firmware is a well-known piece of custom (third-party) firmware designed for ASIC miners, especially the Bitmain Antminer L3+ and L3++ models. Its main goal is to unlock advanced controls and optimizations not accessible in the original stock firmware, offering users more flexibility in mining performance, energy usage, and operational stability.

Key Features of Blissz Firmware

Unlike the standard firmware that comes pre-installed by Bitmain, Blissz firmware provides miners with a range of powerful features:

What is Blissz Firmware - free download
What is Blissz Firmware - free download

  • Advanced overclocking and undervolting: Fine-tune the frequency and voltage settings on a global or per-chain (board) basis. This allows for optimizing performance and lowering power consumption—often achieving 20% or more energy savings compared to stock firmware, while maintaining or even increasing hash rate.

  • Individual chip and board tuning: Tweak problematic chains individually to reduce hardware errors, maximize stability, and push your hardware closer to its true potential.

  • Custom fan and thermal control: Set custom fan profiles for quieter or safer operation and monitor temperatures of chips and PCBs in real-time.

  • Power monitoring: Read actual wattage usage per chain directly from the miner’s status page, making it easier to manage power draw without needing extra hardware meters.

  • API improvements and faster status updates: More responsive and cleaner user interface for monitoring and configuring the miner.

  • No developer fee options: There are versions (“No Fee”, “Dev Free”) that don’t divert mining income to firmware creators, making it popular among miners seeking maximum reward.

Typical User Experience of Blissz Firmware

Many miners using Blissz firmware on their L3+ or L3++ report:

  • Higher hash rate at equal or lower power draw—common settings reach over 500 MH/s at 650–700 watts, with some users pushing their devices safely well beyond factory limits.

  • Fewer hardware errors and more stable operation due to the ability to fine-tune voltage and frequency settings per board or chain.

  • Quieter mining due to more customizable fan settings, with silent modes available.

  • The ability to experiment and find the sweet spot between speed, efficiency, and longevity for each individual device.

What is Blissz Firmware - free download
What is Blissz Firmware - free download

Installation, Compatibility, and Support Blissz Firmware

  • Blissz firmware is flashed via the usual Antminer upgrade process (System → Upgrade → Flash new firmware image).

  • Before flashing, it’s often recommended to set the stock miner frequency to a conservative value (e.g., 350 MH/s) to ensure a smoother upgrade.

  • It supports Antminer L3+, L3++, and select other models, and is compatible with major mining pools and remote monitoring tools.

  • Development and official support for Blissz has effectively ended due to copyright and legal reasons, but the firmware remains widely used and circulated through the mining community.

Pros and Cons of Blissz Firmware

Advantages:

  • Significant efficiency gains and performance flexibility compared to stock firmware.

  • Granular control over each miners settings.

  • No-fee versions exist, so 100% of mining rewards go to the operator.

  • Community-driven, tested by thousands of miners over years.

Potential downsides:

  • No active development or official support—risk of bugs or incompatibilities with future hardware/algorithms.

  • Installation risk: As with any custom firmware, improper flashing can “brick” the miner or void the manufacturer warranty.

  • Legal status: Because it is not authorized by Bitmain and development has stopped, updates and bug fixes are limited.

Blissz firmware made a major impact among Antminer L3+ and L3++ owners, unlocking new levels of efficiency, customizability, and profitability. Despite being an older and now unsupported project, it remains a valuable option for those looking to maximize the ROI of their ASIC miners, as long as users carefully follow installation instructions and understand the risks involved.

Blissz demonstrates how custom firmware can greatly enhance the capabilities of mining hardware—but also why miners should always research, test, and use trusted versions to protect their valuable equipment