Most users see this message even when their Wi-Fi is working perfectly. The driver often tries to load several firmware versions in sequence. If you see this error followed by a line like loaded firmware version XX.X... , then the driver successfully found a working operational firmware and the "yoyo" failure can be safely ignored. How to Fix (or Silence) the Issue
This prevents the -ENOENT error but does not provide real debug features. iwlwifi firmware failed to load iwldebugyoyobin exclusive