How to Recover from Firmware Update Failure feat. Blue screen

Symptom: The device displays blue screen with nothing or blinking with text of "ULT-M100".

Possible Causes of Firmware Update Failure:

1. Temporary Bluetooth instability causing signal interruption.
2. Power connection is interrupted due to external factors.

In these cases, you can recover by retrying the firmware update as below. 

Steps for Firmware Recovery:

1. Connect the power to the ULT-M100 that encountered the firmware update failure and turn it on

2. On the GDS menu, go to “BMS - Battery Control / High Voltage Battery Pack and Coolant Line Leak Test.”

   

3. In the device connection screen, search for your ULT-M100. (Battery code does not need to be scanned for FW recovery)

   

   

4. Upon attempting the connection, a screen will display checking firmware version. When connected, the device's blue light will turn on and FW update will be started. During the update, it will light and blink in Orange. And tap [OK] to start firmware recovery.

   💡 If the firmware update fails

   For example, repeatedly fails at a certain percentage during the  update, you can perform a forced firmware update as follows:

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   • While your leak testeris connected to a tablet(blue light on),
   • Touch the area near the blue light with ‘Pressure Sensor Module for Battery Pack’ pack[G7XHDNN008]. 

   • The status light (orange) will start blinking approximately every 4 seconds, entering forced firmware download mode.

      

   

   

    

5. After completing FW update, you need to rescan and pair ULT-M100 to your tablet. 

   

6. After selecting the device, tap "OK" and start diagnosis. 

   

7. When the firmware update reaches 100%, the device will reboot, completing the update.