Wi-Fi GHz Troubleshooting Guide 

Android Digital Signage Devices (Android 9, 10, 11, 14)

Step 1 – Basic checks (do this first)
Before changing any advanced settings, confirm the following:

• The Wi-Fi name (SSID) and password are correct.
• Other devices (phones or laptops) can connect to the same 5 GHz network.
• The signage device is close to the router or access point.
• The router is not using MAC address filtering.

If all items are correct, continue.

Step 2 – Force WPA2-PSK only (very important)
Many Android devices fail when the router uses mixed security modes.
Router / Access Point

• Set Wi-Fi security to WPA2-PSK only.
• Do not use WPA2/WPA3 mixed mode.
• Do not use “Auto” security modes.
• Make sure WPA3 is fully disabled.

Why:  Some Android builds fail silently when WPA3 is detected, even if it is not used.

Step 3 – Disable Wi-Fi 6 (802.11ax)
Many signage devices support 5 GHz but do not support Wi-Fi 6.
Router / Access Point

• Disable Wi-Fi 6 / 802.11ax.
• Set wireless mode to:
  • 802.11ac, or
  • 802.11n/ac only

Why: Wi-Fi 6 can cause association failures on older or embedded Android devices.

Step 4 – Lock the 5 GHz channel (avoid DFS channels)
This is one of the most common causes of connection issues.
Router / Access Point

• Set the 5 GHz channel manually:
  • Use 36, 40, 44, or 48
• Avoid DFS channels (52–144)
• Set channel width to:
  • 20 MHz or 40 MHz
  • Avoid 80 MHz

Why: DFS channels can change automatically and many Android devices cannot handle them correctly.

Step 5 – Disable fast roaming and enterprise features
These features are not needed for signage devices and often cause compatibility problems.
Router / Access Point

Disable the following if available:

• 802.11r (Fast Roaming)
• 802.11k
• 802.11v
• Protected Management Frames (PMF):
  • Set to Disabled or Optional.
  • Do not set to Required.

Why: These features are designed for enterprise Wi-Fi, not for embedded Android devices.

Step 6 – Change MAC address mode on the device
Some routers do not work well with randomized MAC addresses.
Android device

1. Go to Settings.
2. Tap Network & Internet (or Connections).
3. Tap Wi-Fi.
4. Tap the connected network, or tap the wrench icon next to the network.
5. Tap Advanced.
6. Find MAC address type.
7. Switch between:
   • Randomized MAC
   • Device MAC
8. Reboot the device.
9. Try connecting again.

Why: Randomized MAC can cause authentication or association issues with some routers.

Step 7 – Fully clear the Wi-Fi configuration
This removes corrupted or cached settings.
Android device

1. Go to Settings.
2. Tap Network & Internet → Wi-Fi.
3. Tap Saved networks.
4. Remove (Forget) all Wi-Fi networks.
5. Power off the device.
6. Unplug it from power.
7. Wait at least 60 seconds.
8. Power it back on.
9. Add the Wi-Fi network again from scratch.

Why: Android may keep invalid parameters that prevent proper reconnection.

Step 8 – Confirm date and time settings
Incorrect system time can break Wi-Fi authentication.
Android device

1. Go to Settings.
2. Tap System.
3. Tap Date & time.
4. Enable:
   • Use network-provided time.
   • Use network-provided time zone.

Why: An incorrect clock can cause silent WPA authentication failures.

Step 9 – Check Wi-Fi status messages or logs (if available)
Some devices show connection status messages.
Android device

1. Go to Settings.
2. Tap Network & Internet → Wi-Fi.
3. Tap the network name.
4. Look for error messages such as:
   • Authentication failure
     → Usually a security or password issue
   • Association rejected
     → Usually a channel, band, or compatibility issue

Why: These messages help identify whether the problem is security-related or radio-related.

Step 10 – Test with a different 5 GHz network
If possible:

• Connect the device to another router or hotspot.
• Use simple settings:
  • WPA2-PSK only
  • No Wi-Fi 6
  • Channel 36–48

Why: This helps determine whether the issue is router-specific.

Step 11 – Firmware update and reset
If the problem continues:

• Check for firmware or system updates.
• If available:
  • Reset network settings, or
  • Perform a factory reset (only if safe to do so)

Step 12 – Consider hardware issues (last step)
If all steps above are confirmed and:

The device can see 5 GHz networks. But cannot connect to any 5 GHz network. Even after reset and update.

Then consider:

• Possible Wi-Fi module issue
• Possible internal antenna issue

Important note: If the device consistently sees 5 GHz SSIDs, a compatibility issue is still more likely than a hardware failure.