Disclaimer: Legacy driver installations are done at your own risk. Always create a system restore point before installing old drivers on Windows 11.
A: Yes, the same WDM driver works for all suffixes: MX, 6CH-MX, SX, LX. The differences are in analog-to-digital converter quality, not the driver.
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Are you currently getting an (like Code 52 or Code 10) in Device Manager?
The most stable drivers for the CMI8738 on modern systems are actually the drivers designed for Windows 7 or Windows 8.1. These often work perfectly on Windows 10 and 11 due to shared architecture.
Finding a dedicated Windows 11 64-bit driver for the can be difficult because the hardware is legacy. However, you can often achieve full functionality by using the Windows 10 64-bit drivers in Compatibility Mode. Direct Download Sources