PRIMUS Firmware Update — V1.57 Release Notes
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We are excited to introduce PRIMUS Firmware V1.57, bringing extraction control, precision tuning, and an upgraded Over-The-Air (OTA) update system straight to your machine.
This update focuses on expanding your extraction toolkit, giving you control over pressure and flow variables while simplifying how your machine receives future firmware updates.
Important System Warnings - Please read before updating
CRITICAL REGIONAL COMPATIBILITY WARNING
This firmware update is strictly region-specific. We are concurrently launching two entirely separate firmware packages tailored specifically to the Hong Kong (HK) and European Union (EU) editions.
Before downloading or starting the update, you must verify your machine's regional designation by checking the silver rating label on the chassis / packaging:
- Hong Kong Edition: Must use the HK update package — compatible with model KD-360X(BK/SL/WH)HK.
- European Union Edition: Must use the EU update package — compatible only with model KD-360X(BK/SL)EU
Regional Distribution Guide (Where these machines are typically found):
· HK Version: Distributed primarily in Hong Kong, the UK, the Middle East, Thailand, Singapore, Malaysia and Indonesia.
· EU Version: Distributed primarily in Europe and Thailand.
Crucial Package Restrictions & Australian (AU) Exceptions:
- Select the correct file for your region. We do not recommend cross-flashing or attempting to switch between the HK and EU packages. Installing the incorrect firmware file can cause immediate software conflicts, interface errors, or functional abnormalities.
- Exception for Early Australian (AU) 15-Amp Batches: If you own one of the initial batch machines delivered to Australia built to a 15-Amp rating, which has a 15A plug featuring a wider grounding/earth pin, your hardware configuration is fully compatible with the European package. Users with this specific 15A AU configuration should install the EU firmware package.
- Standard AU (10A) and CH versions must wait for a separate package to be released. These machines feature distinct internal power configurations engineered specifically to fulfil local 10A current limit restrictions. Attempting to install the HK or EU firmware onto a standard 10A AU or CH machine will conflict with these physical hardware specifications, leading to system instability or permanent component damage.
CRITICAL WARNING: FIRMWARE DOWNGRADE RESTRICTION
Never downgrade the machine's firmware to an older version. Installing a previous firmware version may cause system instability, functional abnormalities, or permanent machine malfunction.
Key Features & Enhancements
1. Volume Control in Fixed Pressure Mode
Achieve perfect extraction consistency with the touch of a button. This feature allows you to set a fixed pressure limit while maintaining automated volumetric cut-offs. Once your target volume is reached, the machine automatically stops the shot, ensuring repeatable recipes every time.
2. Real-Time Manual Flow Control
Unlock total profiling freedom. You can now adjust water flow dynamically in real time during extraction. This allows you to respond to the shot as it develops—tapering flow to prevent channelling or extending pre-infusion on the fly.
3. New Over-The-Air (OTA) Update Function
Staying up to date is now effortless. We have added a dedicated Update Software feature directly inside the machine’s Settings menu. Once V1.54 is installed, future updates will no longer require developer mode or manual file download—simply navigate to Settings to check for the latest available firmware and update your machine with a single touch.
Bug Fixes & Performance Improvements
- Resolved Heating Issues: Fixed intermittent heating bugs found in initial software versions to ensure more reliable, stable thermal performance and temperature accuracy during back-to-back extractions.
- Incorrect pressure: Fixed the issue where an incorrect pressure value was displayed after hot water dispensation, specifically in "Manual Variable Pressure" and "Semi-Automatic" modes
- General System Stability: Patched minor software glitches to improve overall screen responsiveness and system reliability.
Installation Safety Note: Do not turn off your machine, attempt to brew, or disconnect the power source at any point during the file upload and installation process.
The Updater only needs to be downloaded once. For users who are currently on V1.1.49 or earlier should download the Updater. Users who have already downloaded the Updater and are receiving OTA updates on their machines are not required to redownload this.
PRIMUS Firmware Updater HK Version 2026.06.30