Use balong_flash or huawei_flash tool:
Did you lose power during a firmware update, or did the device stop working spontaneously E8372h-153 - postmarketOS Wiki E8372h-153 Dead Boot Repair
The E8372h-153 has engineering test points hidden under the metal shield. Accessing UART gives you raw boot log output and interrupt ability. Use balong_flash or huawei_flash tool: Did you lose
Wait for the progress bar to reach 100%. during this stage, as it can permanently brick the hardware. E8372h-153 Dead Boot Repair
This article provides a deep-dive engineering approach to reviving a in a dead boot state using both hardware (JTAG/UART) and software (Bootloader interrupt) methods.