Microsoft Update occasionally overwrites the driver. Go back to Device Manager, right-click the reader, select > Browse my computer > Let me pick from a list . Manually select the ACS driver from the list.

: Be aware that users on Windows 11 ARM (e.g., Surface Pro 9 or Parallels on Mac) may face additional hurdles, as some older ACR1281U drivers are strictly x86-based. Drivers / Manuals / Datasheets - Advanced Card Systems Ltd