Unable to connect - 4.3 update

I have a FEZ Hydra and I am trying to update it to 4.3. I followed the steps for erasing the device. I was able to successfully erase the device and then to update the framework when I connect USB, I get the following error from FEZ Config

Failure - Device is not connected or not responding.
Pinging…
Failure - Device is not connected or not responding.
Connecting to device
Failure - Device is not connected or not responding. No response from device.
Connecting to FEZ Hydra_Gadgeteer
Failure - Device is not connected or not responding. No response from device.
Connecting to FEZ Hydra_Gadgeteer
Failure - Device is not connected or not responding. No response from device.

I got the same errors with my other Hydra board and somehow it worked after sometime. I am not sure if I am doing something wrong. I even rebooted my machine. Still no luck. Oh and I am using an external power supply too.

What is the version of your Loader (TinyBooter) installed on your device?

The troubleshooting guide is a good place to start.