An rfu file extension is used for Remote Firmware Upgrade of HP printers.
RFU file extension - HP Remote Firmware Upgrade
What is rfu file? How to open rfu files?
File type specification:
The rfu file extension is associated with the HP Remote Firmware Upgrade service that allows users and administrators to update firmware of their HP Color LaserJet 4600, 4650, 5500, or 5550 series printer or other HP printers.
The rfu file stores firmware update.
This rfu file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.