Fixing the Nano Duo Screen Stuck on the LONGER Logo

If your Nano Duo screen remains stuck on the LONGER logo during startup, the issue can usually be resolved by reflashing the firmware. Follow the steps below carefully to restore normal operation.

1.Prepare tools
Use the flash_download_tool_3.9.5.exe tool

2.Preparing firmware
firmware_grbl.bin

3.Open the flash_download_tool_3.9.5.exe tool, select ESP32-S3, and click OK.

4.After entering the homepage, click the three dots in the middle, find the prepared firmware and open it. The second step is to change the firmware to: 0x0, select the COM port corresponding to the machine's port number, and select BAUD: 912600. Click ERASE and wait for the status to complete. Then click START and wait for the status to display FINISH. Finally, power off and restart the machine.

Conclusion

That’s the complete procedure for resolving the issue where the Nano Duo screen is stuck displaying the LONGER logo. The success of this process mainly depends on accurate parameter configuration and following the flashing steps in the correct order. As long as each setting is verified carefully and the sequence is strictly followed, the firmware recovery can be completed smoothly and safely.