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To avoid a required reboot when you update a UMDF driver, specify the COPYFLG_IN_USE_RENAME flag in the CopyFiles Directive in your driver's INF file, as shown in this example:
[VirtualSerial_Install.NT]
CopyFiles=UMDriverCopy
[UMDriverCopy]
Virtualserial.dll,,,0x00004000 ; COPYFLG_IN_USE_RENAME