Third-party firmware voids your warranty. Also, the E8372h-155 has limited RAM (128MB), so OpenWRT runs slowly. Stick to official unless you are a developer.
HiSilicon/Huawei update tool (loader or flash tool) huawei e8372h-155 firmware update
: Download and install updates automatically during a user-specified time period to minimize disruption to your internet connection. Configuration retention Third-party firmware voids your warranty
Huawei E8372h-155 Firmware Update: A Complete Guide The is a versatile 4G LTE "Wingle"—a device that functions as both a USB modem and a portable Wi-Fi hotspot. Keeping your device's firmware updated is critical for maintaining stable connectivity, patching security vulnerabilities, and ensuring compatibility with newer network standards and accessories. Why Update Your Huawei E8372h-155 Firmware? HiSilicon/Huawei update tool (loader or flash tool) :
Use this only if you have a specific firmware file ( .bin or .zip ) provided by your carrier or Huawei support.