• Use the OMI App: Settings > Device Settings > Update Firmware
  • Or follow the manual update process below

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Flashing Instructions for DevKit Versions (DK1 & DK2)

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Manual Update Process​

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1. Download Required Files​

  1. Bootloader (required for first-time setup or if corrupted):
    • Download bootloader0.9.0.uf2
    • Compatible with Seeed XIAO nRF52840 Sense (SoftDevice S140 7.3.0)
  2. Firmware:

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2. Prepare Your Device​

Before starting:
  • Ensure device battery is above 50%
  • Use a direct USB connection (avoid USB hubs)
  • Have a small pin ready for the reset button

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3. Enter DFU Mode​

  1. Connect your device via USB
  2. Locate the DFU/Reset button:
    • DevKit 2: Remove lid, find button labeled “RST” DFU Button Location, DevKit 2
    • DevKit 1: Use button shown below DFU Button Location, DevKit 1
  3. Double-click the reset button quickly
  4. Your computer should show a drive named /Volumes/XIAO-SENSE

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4. Flash the Device​

  1. Install Bootloader (if needed):
    • Drag bootloader0.9.0.uf2 to the /Volumes/XIAO-SENSE drive
    • Wait for the drive to eject automatically
    • Put device back in DFU mode (repeat step 3)
  2. Install Firmware:
    • Drag the firmware .uf2 file to the /Volumes/XIAO-SENSE drive
    • Wait for completion (ignore “transfer incomplete” messages)
    • Device will restart automatically

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Troubleshooting​

  • If device isn’t recognized: Try a different USB cable or port
  • If update fails: Retry the process
  • If you see “transfer incomplete”: Wait 30 seconds before checking device status
  • For additional help: See DevKit2 Firmware Guide

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Flashing Instructions for Consumer Version 1 (CV1)

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Flashing Omi Firmware v3.0.8

This guide provides step-by-step instructions for flashing the Omi firmware using J-Link on both macOS and Windows systems.

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Prerequisites

  • Omi CV1 device connected via USB
  • J-Link software installed (see installation instructions below)
  • Appropriate USB drivers for your device
  • Latest firmware files downloaded from GitHub releases

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Special Hardware Requirement

To flash the Omi CV1, you must use a special flashing cable that connects the device to the J-Link programmer.
This cable provides the required SWD/JTAG interface and must be acquired before attempting to flash.
Without this cable, the CV1 cannot be programmed. Ensure that:
  • The cable is properly connected to both the Omi CV1 and the J-Link programmer (pinout must match SWDIO, SWCLK, GND, VCC).
  • The cable is secure and undamaged before starting the flashing process.
⚠️ If you do not have this cable, you will need to source one before proceeding with the CV1 flashing steps.

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Important: Update Firmware Files Before Flashing

⚠️ Critical Step: Before flashing, you must replace the existing firmware files with the latest versions from GitHub releases.

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Step 1: Download Latest Firmware

  1. Go to the Omi GitHub Releases page for Omi Consumer (CV1)
  2. Find the latest release version
  3. Download the following files:
    • merged.hex — Application core firmware
    • merged_CPUNET.hex — Network core firmware

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Step 2: Replace Existing Firmware Files

For macOS:
  1. Navigate to the MAC/ folder in your FLASH_3.0.8 directory
  2. (Optional) Backup existing files: 
    mv merged.hex merged.hex.backup
mv merged_CPUNET.hex merged_CPUNET.hex.backup
  3. Copy the downloaded merged.hex and merged_CPUNET.hex into the MAC/ folder
For Windows:
  1. Navigate to the WINDOWS\ folder in your FLASH_3.0.8 directory
  2. (Optional) Backup existing files:
    • Rename merged.hex → merged.hex.backup
    • Rename merged_CPUNET.hex → merged_CPUNET.hex.backup
  3. Copy the downloaded merged.hex and merged_CPUNET.hex into the WINDOWS\ folder

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Step 3: Verify File Replacement

  • Ensure both merged.hex and merged_CPUNET.hex are updated
  • File sizes should match the downloaded versions
  • Modification dates should reflect the replacement

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macOS Instructions

  1. Install J-Link Software from SEGGER
  2. Navigate to the MAC folder: 
    cd MAC
  3. Flash the firmware: 
    # Flash network core first
JLinkExe -CommanderScript program_net.jlink

# Then flash application core
JLinkExe -CommanderScript program_app.jlink

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Windows Instructions

  1. Install J-Link Software from SEGGER
    • Add J-Link installation path to your Windows PATH (default: C:\Program Files\SEGGER\JLink\)
  2. Navigate to the WINDOWS folder: 
    cd WINDOWS
  3. Flash the firmware: 
    # Flash network core first
JLink.exe -CommanderScript program_net.jlink

# Then flash application core
JLink.exe -CommanderScript program_app.jlink

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Verification

  • If LEDs start blinking → flashing was successful 🎉
  • Device should now run the latest firmware
  • Confirm firmware version in the Omi app or device interface

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Troubleshooting

  1. JLinkExe not found → Recheck installation and PATH
  2. Connection issues → Try another USB port/cable, ensure programming mode
  3. Flashing fails → Flash network core first, wait for commands to complete
  4. Firmware file errors → Ensure files are latest, re-download if corrupted

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Congratulations!​

Your OMI device is now updated with the latest firmware. Enjoy the enhanced features!