en 07 troubleshooting

7. Troubleshooting

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Screen stays black on startup

• Hold the side button for 2 seconds
• If no response: charge the battery (plug in USB)
• If the issue persists: reflash the firmware via the Web Flasher

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GPS cannot get a fix

• Go outdoors, in an open area
• Wait 1–2 minutes (cold start)
• Check the HDOP indicator on the dashboard (should show + or -)
• An X means the signal is too weak

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No LoRa packets received

1. Check the frequency in Settings → LoRa Frequency (433.775 MHz for Europe)
2. Make sure the antenna is properly attached
3. Check that there are active stations in your area on aprs.fi

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Map is grey / no tiles

• SD card not inserted or not recognized
• Tiles not in the correct location (see SD Card)
• Check that the SD card is formatted as FAT32
• Reboot after inserting the SD card

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Bluetooth won't start

• Make sure WiFi is disabled (WiFi and BLE are mutually exclusive)
• Reboot and try again
• If the error persists, it is a memory constraint — see note below

On the ESP32-S3, WiFi and BLE share the same internal DRAM. They cannot be active at the same time.

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BLE disconnects when I open the map

This is normal. Bluetooth is automatically paused when the map is opened to free memory, and resumes automatically when the map is closed.

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Messages are not saved

• Check that the SD card is present and recognized
• Without an SD card, messages are lost on reboot

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Device reboots on its own

• Low battery: charge via USB
• Insufficient memory during a heavy operation: reboot and avoid using WiFi + Map at the same time
• Check the serial logs (115200 baud) to identify the cause

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Full Reset

To erase all configuration:

1. Reflash with the Erase device option checked in the Web Flasher
2. OR delete config.json from the SD card

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Getting Help

• GitHub Issues: moricef/LoRa_APRS_Tracker
• French APRS forum: f5len.org