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Welcome to Elo Support

Drivers, Product Info, Technical Answers and more.

How can I force the Elo Backpack into Stretched/Fullscreen mode?

How to Force Elo Backpack into Stretched (Fullscreen) Mode

This article provides the steps required to force an Elo Backpack device into stretched (fullscreen) display mode.

⚠️ Important: This process is only required when using a square (4:3) monitor. It does not change the output resolution, it stretches the image to fill the screen.
⚠️ Backpack 5 Requirement: You must use a USB-C connection to access bootloader mode. HDMI connections will block access. See this article for details.

Requirements

  • Host computer (Windows, macOS, or Linux) with ADB and Fastboot installed
  • USB Type-A to Type-A cable
  • Elo Backpack device with connected display
  • Elo fullscreen configuration file (elo_cust.xml)

Procedure

  1. Ensure the Backpack is updated to the latest EloView image.
  2. Enable Developer Options and turn on ADB debugging.
  3. Power off the Backpack. Then press and hold the HOME button while reconnecting power.
  4. After 10 to 15 seconds, the Android Recovery menu will appear:
    • Use the HOME button to navigate
    • Use the POWER button to select
    • Select Fastboot Mode
  5. Connect the USB Type-A cable:
    • One end to the Backpack (port next to the DC power connector)
    • The other end to the host computer

  6. Verify the device is detected. On the host computer, run:

    fastboot devices

    The device serial number should appear.

  7. Run the following commands:

    fastboot oem root Qon
    fastboot reboot
  8. Disconnect the USB cable.
  9. Power cycle the Backpack by unplugging and reconnecting power.
  10. After the device boots, connect using ADB. 
    (Reference article Android Debugging for ADB connection steps.)
  11. Place the elo_cust.xml file in the same folder as your ADB/Fastboot tools.

  12. Run the following commands:

    adb push elo_cust.xml /eloconf/conf/
    adb reboot
  13. After reboot, the display will be stretched to fullscreen mode.

Result

The Elo Backpack will now display in stretched (fullscreen) mode, filling the entire screen on square aspect ratio monitors.

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