If you own this workhorse (and let’s be real, it is a beast when it works), you’ve likely seen the "Firmware Update Available" notification on the touchscreen. Before you hit "Download," you need to understand exactly what HP is pushing and why the community is split on whether to install it.

2. Manual Update with HP Printer Update Utility (USB or Network)

The file will typically be a "Firmware Update Utility" (executable for Windows) or an .rfu file for manual transfers. Methods to Update Your Firmware

Do use the "Check for Updates" button on the printer’s screen. Do not let HP Smart auto-update.

This post is for informational purposes. Always verify your printer’s current firmware version under Settings > General > About before making changes.

Update reaches 95% -> printer freezes -> screen goes blank -> fans spin forever. Cause: The M477 has a notoriously small volatile memory buffer. If a single packet drops over Wi-Fi, the flash write corrupts.