FAQ

Q1: Community Support

Please refer to https://docs.radxa.com/welcome

Q2: Radxa ZERO 3 Unable to Boot from microSD Card

If your Radxa ZERO 3 cannot boot from a microSD card, follow these troubleshooting steps:

Check Power Supply

• Ensure using a 5V power adapter
• Recommended: Radxa Power PD30W
• Check if the Type-C cable is working properly
• Ensure the power interface is correctly connected (USB 2.0 OTG Type-C port)

Check microSD Card

1. Card Quality: Use high-quality, reliable brand microSD cards
2. Capacity: Ensure card capacity ≥8GB
3. Burn Tool: Use recommended burning tools (like balenaEtcher)
4. Image Integrity: Redownload the image and verify the hash
5. Burn Process: Ensure the burning process completes fully without interruption

Boot Indicators

• During normal boot, the power LED should stay on
• If the LED blinks or remains off, there may be a power issue

Serial Debugging

If all above steps are normal, connect via serial port to check boot logs:

1. Connect UART to USB adapter to the debug serial port
2. Use serial tools (like minicom, screen) to view output
3. Observe error messages during the boot process

Q3: What Storage Devices Does Radxa ZERO 3 Support for Boot?

Radxa ZERO 3 supports booting from:

• microSD Card (primary boot method)
• eMMC (requires additional module)
• USB Storage Devices (via USB boot)

Q4: How to Install OS to eMMC?

Please refer to the Install OS to eMMC guide.

Q5: What Are the Power Requirements for Radxa ZERO 3?

Radxa ZERO 3 only supports 5V power supply:

• Input Voltage: 5V DC
• Recommended Power: ≥15W (for stable operation)
• Interface: USB 2.0 OTG Type-C port

Important

Do not use power adapters above 5V as this may damage the device.

Q6: How to Debug Radxa ZERO 3 via Serial Port?

1. Connect Serial Port:

   • Use UART to USB adapter
   • Connect GND, TX, RX pins
   • Baud rate: 1500000

2. View Boot Logs:

   • Connect serial port before powering on
   • View boot process in serial terminal

3. Common Serial Tools:

   # Linux/macOS
   screen /dev/ttyUSB0 1500000
   
   # Windows
   # Use PuTTY or Tera Term

Q7: What Are the Default Login Credentials for Radxa ZERO 3?

For Radxa OS images:

• Username: radxa
• Password: radxa

For Debian/Ubuntu images:

• Username: root
• Password: radxa

Q8: How to Update System Packages?

# Update package lists
sudo apt update

# Upgrade installed packages
sudo apt upgrade

# Clean up unnecessary packages
sudo apt autoremove

Q9: Does Radxa ZERO 3 Support Wi-Fi and Bluetooth?

Yes, Radxa ZERO 3 supports Wi-Fi and Bluetooth:

• Wi-Fi: Supports 2.4GHz and 5GHz bands
• Bluetooth: Supports Bluetooth 5.0

If experiencing connection issues:

1. Check if antenna is connected (if applicable)
2. Ensure drivers are properly loaded
3. Check network configuration

Q10: How to Check Hardware Information?

# View CPU information
cat /proc/cpuinfo

# View memory information
free -h

# View storage devices
lsblk

# View network interfaces
ip addr

# View system version
cat /etc/os-release

Q11: What to Do for Other Issues?

1. Check Official Documentation: https://docs.radxa.com/zero/zero3
2. Visit Community Forum: Get community support
3. Contact Technical Support: Submit issues through official channels

tip

When seeking help, please provide:

• Image version used
• Hardware configuration
• Error logs or screenshots
• Steps already attempted to resolve