Firmware update

CremaLoop slow feeders (Metal, Ultra, Pro V2) can be updated two ways:

Wi-Fi (OTA)

• ✓ Any phone or computer
• ✓ Keeps your settings
• ! Download the .bin first: joining the feeder's Wi-Fi drops your internet

USB-C flash

• ✓ One click on this page, no file to download
• ✓ Also recovers a feeder that won't start
• ! Desktop Chrome or Edge only
• ! Clean install: resets stored settings

Download the file first if updating over Wi-Fi

Connecting to the feeder’s Wi-Fi drops your normal internet connection - so download the right .bin below before you connect. (USB-C flashing fetches the file for you.) Only ever install official CremaLoop firmware.

Latest firmware

Pick your device, then either download the .bin (for Wi-Fi OTA) or click USB-C flash.

Slow Feeder Metal

Battery-powered, variable-speed

Release notes

• Wave 3 & newer: v2.2. The motor never starts by itself on the charger, plugging in the charger wakes the feeder, and anti-stall is more reliable at low dial numbers.
• Wave 1 & 2: v1.3. Low-battery LED warning and a stronger startup kick at low dial numbers.
• Pick your production wave below - the firmware differs.

Wave 3 & newer

Download v2.2 (OTA)

⚡ USB-C flash v2.2USB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

Wave 1 & 2

Download v1.3 (OTA)

⚡ USB-C flash v1.3USB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

Slow Feeder Ultra & Pro V2

Same firmware as Metal Wave 3+

v2.2 latest

Release notes

• The motor never starts by itself on the charger: plugging in stops it, and only a button press starts it again
• Plugging in the charger wakes a sleeping feeder so you can see the charging status; it stays awake while charging
• More reliable anti-stall at low dial numbers (below about 4)
• More robust Wi-Fi (OTA) updates
• Build 2.2.7 (20 Oct 2026): while charging the button glows slowly instead of blinking, and it goes off when the battery is full

Download v2.2 (OTA)

⚡ USB-C flash v2.2USB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

Not sure which wave you have?

The firmware version is tied to your unit and pre-order wave. If you’re unsure, contact us with your order number and we’ll confirm the right file. Mixing v1.x and v2.x across waves is not supported.

Beta: Grind by Weight

2.3_GBW beta adds grind by weight: the feeder connects to a BOOKOO Themis scale (or, experimentally, an Acaia scale) over Bluetooth and stops when the ground coffee in the cup reaches your target, typically within ±0.1 g. It is stable firmware 2.2 plus grind by weight, so everything else works the same.

For Slow Feeder Metal Wave 1 & 2 there is 1.4_GBW beta: stable v1.3 plus grind by weight, controlled with the power switch and the dial (see the Wave 1 & 2 guide).

Read the guide before installing

This is a public beta. Please read the Grind by weight guide first: it covers the requirements (BOOKOO Themis / Themis Mini scale; Acaia experimental), setup, controls and known limitations. You can go back to stable v2.2 at any time.

Grind by Weight beta

Metal Wave 3+ · Ultra · Pro V2

v2.3_GBW beta

Release notes

• Grind by weight with a BOOKOO Themis or Themis Mini scale (Acaia scales experimental): 3 presses to enter, 1 press to dose
• Phone page with live weight, target setting, dose history and CSV export
• Power-on never starts the motor
• Update of 20 Oct 2026: on battery, leaving grind by weight no longer switches the feeder off; in normal mode a single press reliably stops it (before, it restarted after half a second); a triple-click that counts as 4 presses still switches grind by weight; and the charging light is a slow glow that goes off when the battery is full
• Metal Wave 1 & 2: use the 1.4_GBW beta (next card)
• Read the Grind by weight guide →

Download 2.3_GBW beta (OTA)

⚡ USB-C flash 2.3_GBW betaUSB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

Grind by Weight beta

Metal Wave 1 & 2

v1.4_GBW beta

Release notes

• Grind by weight for Wave 1 & 2 with a BOOKOO Themis or Themis Mini scale (Acaia scales experimental)
• Controlled with the dial: switch on at 0, then 9 and back to 0 to enter; dial up to dose, dial to 0 to stop
• Stable v1.3 plus grind by weight; same phone page
• Update of 20 Oct 2026: the charging light is a slow glow instead of a short flash
• Read the Wave 1 & 2 guide →

Download 1.4_GBW beta (OTA)

⚡ USB-C flash 1.4_GBW betaUSB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

To go back to stable firmware, install v2.2 from Latest firmware. Over Wi-Fi the update page asks “install an OLDER firmware version?” - confirm and it installs normally. On Metal Wave 1 & 2, install v1.3 (leave grind-by-weight mode first; there is no older-version prompt).

How to update over Wi-Fi (OTA)

Wave 3 & newer

Also for the Ultra and Pro V2. See the video above.

1. 1 Download the .bin From the cards above, before you join the feeder's Wi-Fi
2. 2 Press 5 times quickly On the power button. A blinking LED: update mode.
3. 3 Join the feeder's Wi-Fi CremaLoop-XXXX, password cremaloop2025
4. 4 Open 192.168.4.1 Or cremaloop.local. Upload the file; the feeder reboots when done.

Wave 1 & 2

Update mode is opened with the dial:

A blinking LED confirms the feeder is in update mode.

1. 1 Download the .bin From the cards above, before you join the feeder's Wi-Fi
2. 2 Dial sequence Start at 9, then 0, 9, 0, 9 and hold 3 s (above)
3. 3 Join the feeder's Wi-Fi CremaLoop-XXXX, password cremaloop2025
4. 4 Open 192.168.4.1 Or cremaloop.local. Upload the file; the feeder reboots when done.

On the 1.4_GBW beta, leave grind-by-weight mode first: the dial starts and stops doses there.

How to flash over USB-C

The USB-C flash button in the latest-firmware cards installs a clean, complete image straight from your browser - no file download needed. It’s the most reliable way to update, and it also recovers a feeder that won’t boot.

1. 1 Plug in the feeder USB-C data cable to your computer (some cables are power-only)
2. 2 Click USB-C flash On the card for your feeder
3. 3 Pick the serial port From the list the browser shows
4. 4 Erase and install About 30 to 60 seconds, then the feeder reboots

Chrome or Edge, over HTTPS

USB-C flashing uses the Web Serial API, available only in desktop Chrome and Edge (not Safari or Firefox, and not on mobile - use Wi-Fi OTA there). If the browser can’t see the board, hold the BOOT button while plugging in USB-C, then release.

A USB-C flash is a clean install

It writes a full image and erases the chip, so any stored settings (e.g. saved Wi-Fi credentials) are reset - the feeder comes back on factory defaults. USB-C flashing is available for v2.2, v1.3, the 2.3_GBW and 1.4_GBW betas and v2.1; for older versions use Wi-Fi OTA with a previous .bin below.

Previous versions

Older firmware, kept here in case you need to roll back - install these over Wi-Fi OTA (see How to update). The newest build is recommended for everyone else (see Latest firmware).

Slow Feeder Metal

Wave 3 & newer · Ultra · Pro V2

v2.1 previous

Release notes

• Previous stable v2.x build: low-battery LED warning and stronger low-dial startup kick.

Download v2.1 (OTA)

⚡ USB-C flash v2.1USB-C flash (Chrome / Edge only)USB-C flash needs HTTPS

Slow Feeder Metal

Wave 3 & newer · Ultra · Pro V2

v2.0 previous

Release notes

• Original Wave 3 default firmware, before the low-battery warning and startup-kick improvements.

Download v2.0 (OTA)

Slow Feeder Metal

Wave 1 & 2

v1.2 previous

Release notes

• Original Wave 1 & 2 default firmware, before the low-battery warning and startup-kick improvements.

Download v1.2 (OTA)

Need help?

If the update won’t take or the LED doesn’t blink in update mode, see Troubleshooting or contact us with your model and order number.