A legitimate update is usually between 80 MB and 200 MB . If you find a 2 MB file labeled "U581 update," it is likely a virus.
The MemoScan U581 is an older model. If you are running Windows 10 or 11, you may encounter driver signature issues. If the software does not recognize the device, try running the installer in "Windows 7 Compatibility Mode." memoscan u581 update software download new