The LDW931 is often deployed in sealed kiosks or behind display panels. Poor airflow is the #1 environmental cause of "firmware update hot" complaints. The update process requires maximum cooling, which a sealed enclosure denies.
LDW931 4G LTE USB Modem is running "hot" during or after a firmware update, it is often due to the high processing load required for flashing the software or potential background activity from a newly installed version. Update Instructions ldw931 firmware update hot
Note: Flashing firmware carries a risk of bricking your device. Proceed with caution. The LDW931 is often deployed in sealed kiosks