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Hi All,I am working on firmware update of a USB BT Dongle. It is CSR chipset based dongle. After the dongle is switched to dfu mode, the USBDeviceOpen always fails with error kIOReturnExclusiveAccess. From ioreg tool I can see the following interfaces.Interfaces available in Normal Mode+-o USB Link@14600000 <class AppleUSBDevice, id 0x1000012d2, registered, matched, active, busy 0 (5 ms), retain 22> | | | | +-o AppleUSBInterface@0 <class AppleUSBInterface, id 0x1000012e0, registered, matched, active, busy 0 (0 ms), retain 5> | | | | +-o AppleUSBInterface@1 <class AppleUSBInterface, id 0x1000012e3, registered, matched, active, busy 0 (0 ms), retain 5> | | | | +-o AppleUSBInterface@2 <class AppleUSBInterface, id 0x1000012e5, registered, matched, active, busy 0 (0 ms), retain 5> | | | | +-o AppleUSBInterface@3 <class AppleUSBInterface, id 0x1000012e6, registered, matched, active, busy 0 (1 ms), retain 5> | | | | +-o AppleUSBInterface@4 <class AppleUSBInterface, id 0x1000012ea, registered, matched, active, busy 0 (0 ms), retain 5> | | | | +-o AppleUSBInterface@5 <class AppleUSBInterface, id 0x1000012ef, registered, matched, active, busy 0 (0 ms), retain 5>Interfaces available in DFU Mode+-o USB Link@14600000 <class AppleUSBDevice, id 0x100001298, registered, matched, active, busy 0 (0 ms), retain 17> | | | | +-o AppleUSBInterface@0 <class AppleUSBInterface, id 0x1000012a6, !registered, !matched, active, busy 0, retain 4> | | | | +-o AppleUSBInterface@1 <class AppleUSBInterface, id 0x1000012a7, !registered, !matched, active, busy 0, retain 4> | | | | +-o AppleUSBInterface@2 <class AppleUSBInterface, id 0x1000012a8, !registered, !matched, active, busy 0, retain 4>From dfu-util in dfu mode$ ./dfu-util -l 74 ↵dfu-util 0.9Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.Copyright 2010-2020 Tormod Volden and Stefan SchmidtThis program is Free Software and has ABSOLUTELY NO WARRANTYPlease report bugs to http://sourceforge.net/p/dfu-util/tickets/device not found: Operation timed outFound Runtime: [xxxx:xxxx] ver=0033, devnum=54, cfg=1, intf=2, path="20-11", alt=0, name="UNKNOWN", serial="0000000123456789"Why is the dongle in dfu mode always returns kIOReturnExclusiveAccess? How to know which process has seized access to the device?Regards,Rashmi
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