The firmware provides multiple vectors for configuration and debugging:

Always check the "Support" section of the official manufacturer's website first. Search by your router's model number , not the chipset ID. 2. Open Source Alternatives (OpenWrt/LEDE)

If you are looking to update your device, always check your modem's web interface first for an "Update" button, as this is the only official and safe method for most users. bootloader commands for a BCM63381-based device you own?

However, customizing firmware can also be challenging and may require: