Interestingly, the SC6531E often responds to generic USB CDC (Communications Device Class) drivers, albeit unreliably. Tools like can force the device to use the usbser.sys driver (Microsoft’s generic serial driver), but AT command responses are often garbled due to baud rate auto-detection failures.
: This usually indicates an incompatible or outdated driver. Try uninstalling the device from Device Manager and reinstalling the latest version. sc6531e usb driver
