If you encounter any issues during the update process, try:
: Select Manage Updates (or a similar "Maintenance" or "System" option). Update Software in HUAWEI HG255s
: Consider backing up your current settings before updating in case the router resets to factory defaults. If you encounter any issues during the update
Some developers have created OpenWrt or DD-WRT builds for the HG255s. If you are an expert: Update Software in HUAWEI HG255s
: Always use an Ethernet cable for updates. Updating over Wi-Fi is risky as a signal drop can corrupt the firmware.