I had fallen at the first hurdle, couldn't get the linux flash tool to open on my Mint 17.1 installation so used the version v5.1816 (latest) which did.
However when attempting a readback the flash tool gives the error
"
ERROR : STATUS_ERR (-1073676287) , MSP ERROE CODE : 0x00.
"
My PC has no problem communicating with the Gemini as it is quite happy to see android and enter MTP mode. Any ideas anyone?