TechSep 21, 2026Reviving a 100-Yen Junk ACR1251U NFC Reader: Firmware Downgrade & EZ Sign E-Paper Writing on Windows 11A 100-yen junk ACS ACR1251U-M3 from Akihabara showed up in Windows 11 but refused to detect cards. Step-by-step troubleshooting from drivers and registry to firmware patching and updating a Santek EZ Sign.NFCHardwareElectronicsWindowsExperiment
