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DC505 EDID Injection

This page explains how to update the DC505 firmware and inject a custom HDMI or DisplayPort EDID.

Use the rear USB-C service port near the power input.

Do not use the front Collect port for firmware updates or EDID injection.

Firmware Update

Required Files

Download and extract the firmware-update utility:

flash_update_release.rar (Coming Soon)

Download and extract the correct DC505 firmware package.

Example:

DC505DHC_06_16_2026_update.rar

Inside the firmware package, locate the .bin file.

Example:

DC505DHC_06_16_2026_update.bin

Connect the DC505

Connect the rear USB-C service port to a Windows computer.

This is the USB-C port located near the DC505 power connection.

Enter Firmware Update Mode

  1. Turn off the DC505.

  2. Press and hold K2 and K3 at the same time.

  3. While holding K2 and K3, press the DC505 power button.

  4. Continue holding K2 and K3 for approximately two seconds.

  5. Release K2 and K3.

Open the Update Utility

Open:

  1. Select the correct COM port from the Ports menu.

  2. Click OPEN Port.

  3. Check the log window.

The log should repeatedly display:

This means the DC505 is ready for the update.

{% hint style="danger" %} When flash wait for sync does not appear, turn off the DC505 and repeat the update-mode steps. {% endhint %}

Install the Firmware

  1. Click OPEN FILE.

  2. Select the DC505 firmware .bin file.

  3. Click Update Firmware.

  4. Enter the firmware password:

  1. Confirm the update.

  2. Wait for the progress bar to reach 100%.

Do not intentionally disconnect the DC505 during the update.

According to the manufacturer, the update can be repeated after:

  • Power loss

  • A frozen update

  • An interrupted connection

  • A failed update attempt

The unit should not become permanently bricked from an interrupted update.

After the Firmware Update

  1. Close the update utility.

  2. Turn off the DC505.

  3. Start the DC505 normally.

  4. Hold K3 for approximately five seconds.

  5. Allow the DC505 to reset its operating settings.

Custom EDID Injection

Custom EDID injection allows the DC505 to use a manually supplied monitor profile.

This can be used for:

  • Custom refresh rates

  • Modified monitor timings

  • Display compatibility

  • Advanced HDMI profiles

  • Advanced DisplayPort profiles

Required Files

Download and extract:

You will also need the EDID file you want to inject.

Make sure the EDID file matches the connection type:

  • HDMI EDID for HDMI mode

  • DisplayPort EDID for DisplayPort mode

Confirm the Serial Connection

Connect the rear USB-C service port to the Windows computer.

Open Windows Device Manager.

Look for a device similar to:

The COM number may be different on your computer.

When the device does not appear, install the supplied serial driver package:

Enter EDID Programming Mode

  1. Turn off the DC505.

  2. Press and hold K2 and K3.

  3. While holding K2 and K3, press the power button.

  4. Continue holding the buttons for approximately two seconds.

  5. Release K2 and K3.

Open the Programming Utility

Open:

  1. Select the correct COM port.

  2. Click OPEN Port.

  3. Confirm that the log displays:

When another code appears, restart the process from the beginning.

When the log remains blank:

  • Confirm the USB connection

  • Confirm the CH340 device appears in Device Manager

  • Confirm the correct COM port is selected

Inject the EDID

  1. Click OPEN FILE.

  2. Select the correct EDID file.

  3. Choose the matching update option:

    • Click Update HDMI EDID for HDMI.

    • Click Update DP EDID for DisplayPort.

  4. Wait for the progress bar to reach 100%.

  5. Close the programming utility.

  6. Turn the DC505 off.

  7. Turn the DC505 back on.

  8. Hold K1 for 3–5 seconds until the device switches to Mode C.

  9. Short-press K1 to display the on-screen information.

  10. Confirm that the screen shows:

The injected EDID is now active.

Clear Stored Windows EDID Information

Windows may continue storing information from the previously connected display.

When the new EDID does not appear correctly, use the manufacturer’s cleanup utility:

  1. Open the cleanup utility.

  2. Select the EDID cleanup option.

  3. Run the cleanup.

  4. Restart the computer.

  5. Allow Windows to detect the new display profile.

EDID Troubleshooting

EDID Still Shows A or B

  1. Hold K1 for 3–5 seconds.

  2. Continue switching modes until the display shows:

Update Utility Is Blank

  • Confirm the correct COM port is selected.

  • Check Device Manager for USB-SERIAL CH340.

  • Reconnect the USB-C cable.

  • Try another USB port.

  • Reinstall the serial driver.

EDID Update Option Is Unavailable

  • Confirm the port is open.

  • Confirm flash wait for sync appears.

  • Confirm an EDID file has been selected.

  • Confirm the device is in programming mode.

Monitor Is Not Detected After Injection

  1. Switch back to Mode A.

  2. Confirm the monitor works in Mode A.

  3. Reinject the correct EDID type.

  4. Clear stored Windows EDID information.

  5. Restart the computer.

  6. Switch back to Mode C.

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