USB Garmindevice not recognized

Hello,

I've updated my system to 10.11 GM trying to solve a problem related to the USB connection of a Garmin GPS.

Under the 10.10.3 Yosemite system everything worked fine, means that the system recognized the USB device. All programs that have to comunicate to it worked fine.

Then after the latest Yosemite update all stopped working.

So I tried the 10.11 Beta.....nothing changed.....

Few days ago I Installed the 10.11 GM but....nothing happened!

The GPS is reporting "USB connected" but after few seconds it goes Off.

This happened many times (5/6)

Al the programs can't link to the device.

the console reported this errors...

24/09/15 15:25:30,000 kernel[0]: 000090.097944 IOUSBHostDevice@5d100000: IOUSBHostDevice::getDescriptorGated: type 0x01 index 0 length 18 completed with 0xe00002d6 and bytesTransferred 0

24/09/15 15:25:30,000 kernel[0]: 000090.097957 IOUSBHostDevice@5d100000: IOUSBHostDevice::start: failed to get device descriptor

24/09/15 15:25:30,000 kernel[0]: 000090.100324 AppleUSBUHCIPort@5d100000: AppleUSBUHCIPort::resetAndCreateDevice: failed to start device

24/09/15 15:25:30,000 kernel[0]: 000090.100330 AppleUSBUHCIPort@5d100000: AppleUSBUHCIPort::resetAndCreateDevice: failed to create device (0xe00002e9)

24/09/15 15:25:30,000 kernel[0]: 000090.100338 AppleUSBUHCIPort@5d100000: AppleUSBHostPort::resetGated: retrying enumeration in 1600 ms

any suggestion?

Thank you

Claudio

PS: same issue with a SERIAL