What can I do if the firmware update fails with FW004 error? - QNAP
If you are attempting to download and install this firmware to resolve an error or update your device, follow these standard technical procedures: Download u221 004
The term "u221 004" is commonly associated with firmware versioning or error codes in the context of direct-attached storage (DAS) and network-attached storage (NAS) systems. Specifically: What can I do if the firmware update fails with FW004 error