If your LONGER Nano Duo freezes on the LONGER logo during startup, the firmware may be incomplete or corrupted. In most cases, the issue can be resolved by reflashing the firmware with the official recovery tool.

This guide explains the firmware recovery process and the required settings step by step.

Before You Start

Prepare the following items before beginning:

  • Nano Duo machine
  • Windows computer
  • Compatible USB cable
  • flash_download_tool_3.9.5.exe
  • firmware_grbl.bin

Important Notes

Before flashing the firmware:

  • Do not disconnect the USB cable during the process.
  • Do not turn off the machine while the firmware is being written.
  • Make sure the correct COM port is selected.
  • Verify all settings before starting.

Step 1: Prepare the Flash Tool and Firmware

Step 2: Configure Firmware and Flash the Machine

After entering the homepage:

  1. Click the three dots in the middle.
  2. Find the prepared firmware and open it.
  3. Change the firmware to: 0x0
  4. Select the COM port corresponding to the machine's port number.
  5. Select BAUD: 912600
  6. Click ERASE and wait for the status to complete.
  7. Click START and wait for the status to display FINISH.
  8. Power off and restart the machine.

Expected Result

The firmware flashing completes successfully, and the machine restarts normally instead of remaining stuck on the LONGER logo.

Important Notes

  • Wait patiently during both the ERASE and START processes.
  • Do not disconnect cables or close the software during flashing.
  • The process may take several minutes depending on the computer and connection stability.
  • If the status does not display FINISH, repeat the procedure carefully.

If the Recovery Fails

If the machine still remains on the LONGER logo after flashing, check the following:

  • Confirm the correct COM port is selected.
  • Verify that ESP32-S3, 0x0, and BAUD 912600 are set correctly.
  • Make sure the USB connection is stable.
  • Repeat the flashing process if necessary.

Common Problems and Solutions

Problem Possible Cause Solution
Tool cannot detect the machine Incorrect COM port selected Reconnect the machine and select the correct COM port
Flashing stops midway Unstable USB connection Use a stable USB cable and avoid moving the cable during flashing
Screen still stuck on LONGER logo Firmware flashing incomplete Repeat the flashing process carefully
ERASE does not complete Communication interruption Restart the tool and reconnect the machine
START button fails Incorrect firmware configuration Verify 0x0, ESP32-S3, and BAUD: 912600 settings
Machine does not restart normally Firmware corruption remains Repeat the entire firmware recovery sequence

FAQ

1. Why is my Nano Duo stuck on the LONGER logo?

This usually happens because the firmware is corrupted, incomplete, or failed during a previous update or startup process.

2. What firmware file should I use?

Use: firmware_grbl.bin. Do not modify the file name unless official instructions specifically require it.

3. Which chip option should I select in the flashing tool?

Select: ESP32-S3.Choosing the wrong chip type may cause flashing failure.

4. What baud rate should I use?

Set: BAUD: 912600

Do not change this value during the procedure.

5. What does changing the firmware to 0x0 mean?

The firmware address must be configured as:

  • 0x0

This ensures the firmware is written to the correct memory location.

6. What should I do if the flashing process freezes?

Wait several minutes first. If there is still no progress, restart the tool, reconnect the machine, and repeat the flashing process carefully.

7. Can I disconnect the machine during flashing?

No. Disconnecting the machine during flashing may corrupt the firmware further and prevent proper startup.

8. What should I do if the machine still cannot boot after flashing?

Repeat the firmware recovery process and carefully verify all settings and parameters again. Follow official machine specifications or instructions if additional troubleshooting is required.

Conclusion

Following the official firmware recovery procedure can help restore normal startup if your Nano Duo is stuck on the LONGER logo. Always verify the flashing settings before starting to ensure a successful firmware update.

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