We will not be able to provide those HEX files at the moment, but if you download the SDK version 11 and apply the patch SD20_SDK11.patch found in the hex folder, you should be able to compile your own version and be able to run at 1Mbit.
The project used is the examples/ble_central_and_peripheral/ble_connectivity project.
The hex-files provided in the pc-ble-driver are merged with the softdevice, so you have to remember to program this as well to get a working application.
